feat: Add companion agent one-click deployment + fix frontend TS errors

Go deployment orchestrator with platform-specific SteamCMD install,
Rust server download, server.cfg generation, and service registration.
Wire deploy command subscription in daemon, make GameServerPath optional,
add InstallDir config with OS-aware defaults. Fix unused imports and
WebSocket subscribe API in ServerView.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

companion-agent/cmd/agent/main.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"os"
 	"os/signal"
+	"runtime"
 	"syscall"
 	"time"
 
@@ -24,9 +25,12 @@ type Config struct {
 
 	// Game server configuration
 	SteamCMDPath   string `envconfig:"STEAMCMD_PATH" default:"/usr/games/steamcmd"`
-	GameServerPath string `envconfig:"GAME_SERVER_PATH" required:"true"`
+	GameServerPath string `envconfig:"GAME_SERVER_PATH" default:""`
 	GameServerArgs string `envconfig:"GAME_SERVER_ARGS" default:"-batchmode"`
 
+	// Install directory for deployment
+	InstallDir string `envconfig:"INSTALL_DIR" default:""`
+
 	// Optional settings
 	HeartbeatInterval int `envconfig:"HEARTBEAT_INTERVAL" default:"60"`
 	LogLevel          string `envconfig:"LOG_LEVEL" default:"info"`
@@ -44,11 +48,21 @@ func main() {
 		log.Fatalf("Failed to load configuration: %v", err)
 	}
 
+	// Set default InstallDir based on OS if not configured
+	if cfg.InstallDir == "" {
+		if runtime.GOOS == "windows" {
+			cfg.InstallDir = `C:\RustServer`
+		} else {
+			cfg.InstallDir = "/opt/rustserver"
+		}
+	}
+
 	log.Printf("Configuration loaded:")
 	log.Printf("  NATS URL: %s", cfg.NATSUrl)
 	log.Printf("  License ID: %s", cfg.LicenseID)
 	log.Printf("  Game Server Path: %s", cfg.GameServerPath)
 	log.Printf("  SteamCMD Path: %s", cfg.SteamCMDPath)
+	log.Printf("  Install Dir: %s", cfg.InstallDir)
 	log.Printf("  Heartbeat Interval: %ds", cfg.HeartbeatInterval)
 
 	// Create context with signal handling for graceful shutdown
@@ -73,6 +87,7 @@ func main() {
 		GameServerPath:    cfg.GameServerPath,
 		GameServerArgs:    cfg.GameServerArgs,
 		Version:           version,
+		InstallDir:        cfg.InstallDir,
 	}
 
 	// Start daemon

companion-agent/internal/app/daemon.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/nats-io/nats.go"
+	"github.com/vigilcyber/corrosion-companion/internal/deploy"
 	"github.com/vigilcyber/corrosion-companion/internal/files"
 	"github.com/vigilcyber/corrosion-companion/internal/process"
 	"github.com/vigilcyber/corrosion-companion/internal/update"
@@ -22,6 +23,7 @@ type DaemonConfig struct {
 	GameServerPath    string
 	GameServerArgs    string
 	Version           string
+	InstallDir        string
 }
 
 // Daemon manages the companion agent's main operations
@@ -31,6 +33,7 @@ type Daemon struct {
 	gameServer    *process.GameServer
 	fileOps       *files.Operations
 	updater       *update.Updater
+	deployer      *deploy.Deployer
 	subscriptions []*nats.Subscription
 }
 
@@ -44,9 +47,26 @@ type HeartbeatPayload struct {
 	CPUPercent     float64 `json:"cpu_percent"`
 	LastUpdate     string  `json:"last_update"`
 	PlayerCount    int     `json:"player_count"`
-	Version        string  `json:"version"`
+	Version         string  `json:"version"`
-	OS             string  `json:"os"`
+	OS              string  `json:"os"`
-	Arch           string  `json:"arch"`
+	Arch            string  `json:"arch"`
+	ServerInstalled bool    `json:"server_installed"`
+}
+
+// gameServerAdapter wraps process.GameServer to satisfy deploy.GameServerStarter
+type gameServerAdapter struct {
+	gs  *process.GameServer
+	cfg *DaemonConfig
+}
+
+func (a *gameServerAdapter) Start() error {
+	return a.gs.Start()
+}
+
+func (a *gameServerAdapter) UpdatePath(path string) {
+	a.cfg.GameServerPath = path
+	// Recreate game server with new path
+	*a.gs = *process.NewGameServer(path, a.cfg.GameServerArgs)
 }
 
 // NewDaemon creates a new daemon instance
@@ -54,6 +74,8 @@ func NewDaemon(nc *nats.Conn, cfg *DaemonConfig) (*Daemon, error) {
 	gameServer := process.NewGameServer(cfg.GameServerPath, cfg.GameServerArgs)
 	fileOps := files.NewOperations()
 	updater := update.NewUpdater(cfg.Version)
+	adapter := &gameServerAdapter{gs: gameServer, cfg: cfg}
+	deployer := deploy.NewDeployer(nc, cfg.LicenseID, cfg.InstallDir, adapter)
 
 	d := &Daemon{
 		nc:         nc,
@@ -61,6 +83,7 @@ func NewDaemon(nc *nats.Conn, cfg *DaemonConfig) (*Daemon, error) {
 		gameServer: gameServer,
 		fileOps:    fileOps,
 		updater:    updater,
+		deployer:   deployer,
 	}
 
 	return d, nil
@@ -90,6 +113,11 @@ func (d *Daemon) Run(ctx context.Context) error {
 		return fmt.Errorf("failed to subscribe to self-update: %w", err)
 	}
 
+	// Subscribe to deploy commands
+	if err := d.subscribeDeployCommand(); err != nil {
+		return fmt.Errorf("failed to subscribe to deploy commands: %w", err)
+	}
+
 	log.Println("All subscriptions active")
 
 	// Start heartbeat ticker
@@ -267,6 +295,49 @@ func (d *Daemon) subscribeSelfUpdate() error {
 	return nil
 }
 
+// subscribeDeployCommand subscribes to server deployment commands
+func (d *Daemon) subscribeDeployCommand() error {
+	subject := fmt.Sprintf("corrosion.%s.cmd.deploy", d.cfg.LicenseID)
+
+	sub, err := d.nc.Subscribe(subject, func(msg *nats.Msg) {
+		var cmd struct {
+			Action string              `json:"action"`
+			Config deploy.DeployConfig `json:"config"`
+		}
+
+		if err := json.Unmarshal(msg.Data, &cmd); err != nil {
+			log.Printf("Failed to parse deploy command: %v", err)
+			d.respondError(msg, "invalid_command", err.Error())
+			return
+		}
+
+		log.Printf("Received deploy command: %s", cmd.Action)
+
+		// Run deployment in goroutine (it's long-running)
+		go func() {
+			if err := d.deployer.Deploy(cmd.Config); err != nil {
+				log.Printf("Deployment failed: %v", err)
+			} else {
+				log.Println("Deployment completed successfully")
+			}
+		}()
+
+		// Immediately acknowledge the command
+		d.respondSuccess(msg, map[string]interface{}{
+			"status":  "accepted",
+			"message": "Deployment started, progress will be published to deploy.status",
+		})
+	})
+
+	if err != nil {
+		return err
+	}
+
+	d.subscriptions = append(d.subscriptions, sub)
+	log.Printf("Subscribed to: %s", subject)
+	return nil
+}
+
 // handleFileOperation processes file operation requests
 func (d *Daemon) handleFileOperation(msg *nats.Msg) {
 	// Parse common fields
@@ -325,17 +396,18 @@ func (d *Daemon) publishHeartbeat() {
 	diskFree := getDiskFreeSpace(d.cfg.GameServerPath)
 
 	payload := HeartbeatPayload{
-		Timestamp:     time.Now().UTC().Format(time.RFC3339),
+		Timestamp:       time.Now().UTC().Format(time.RFC3339),
-		Status:        "running",
+		Status:          "running",
-		ServerStatus:  status,
+		ServerStatus:    status,
-		UptimeSeconds: int64(uptime.Seconds()),
+		UptimeSeconds:   int64(uptime.Seconds()),
-		DiskFreeMB:    diskFree,
+		DiskFreeMB:      diskFree,
-		CPUPercent:    0.0, // TODO: Implement CPU monitoring
+		CPUPercent:      0.0, // TODO: Implement CPU monitoring
-		LastUpdate:    "", // TODO: Track last SteamCMD update
+		LastUpdate:      "", // TODO: Track last SteamCMD update
-		PlayerCount:   0,  // Populated by plugin, not companion
+		PlayerCount:     0,  // Populated by plugin, not companion
-		Version:       d.cfg.Version,
+		Version:         d.cfg.Version,
-		OS:            runtime.GOOS,
+		OS:              runtime.GOOS,
-		Arch:          runtime.GOARCH,
+		Arch:            runtime.GOARCH,
+		ServerInstalled: deploy.CheckServerInstalled(d.cfg.InstallDir),
 	}
 
 	data, err := json.Marshal(payload)

companion-agent/internal/deploy/config.go

@@ -0,0 +1,71 @@
+package deploy
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// DeployConfig holds the configuration received from a NATS cmd.deploy command.
+// These fields map directly to the Rust game server settings needed for initial deployment.
+type DeployConfig struct {
+	ServerName   string `json:"server_name"`
+	MaxPlayers   int    `json:"max_players"`
+	WorldSize    int    `json:"world_size"`
+	Seed         int    `json:"seed"`
+	ServerPort   int    `json:"server_port"`
+	RconPort     int    `json:"rcon_port"`
+	RconPassword string `json:"rcon_password"`
+}
+
+// DeployStatus represents a progress update published to NATS during deployment.
+// The frontend listens on corrosion.{license_id}.deploy.status for these messages
+// to display real-time deployment progress to the user.
+type DeployStatus struct {
+	Stage     string `json:"stage"`
+	Progress  int    `json:"progress"`
+	Message   string `json:"message"`
+	Error     string `json:"error,omitempty"`
+	Timestamp string `json:"timestamp"`
+}
+
+// Valid deployment stages:
+//   downloading_steamcmd - Downloading and extracting SteamCMD
+//   installing_steamcmd  - Running SteamCMD initial setup
+//   downloading_rust     - Downloading Rust Dedicated Server via SteamCMD
+//   configuring          - Generating server.cfg and identity directories
+//   starting             - Launching the Rust server process
+//   online               - Server is running and accepting connections
+//   failed               - Deployment failed at some stage
+
+// GenerateServerCfg creates the server.cfg file for a Rust Dedicated Server.
+// It writes to {installDir}/server/server/corrosion/cfg/server.cfg, creating
+// the full directory tree if it does not already exist.
+func GenerateServerCfg(installDir string, cfg DeployConfig) error {
+	cfgDir := filepath.Join(installDir, "server", "server", "corrosion", "cfg")
+
+	if err := os.MkdirAll(cfgDir, 0755); err != nil {
+		return fmt.Errorf("failed to create cfg directory %s: %w", cfgDir, err)
+	}
+
+	content := fmt.Sprintf(`server.hostname "%s"
+server.maxplayers %d
+server.worldsize %d
+server.seed %d
+server.port %d
+rcon.port %d
+rcon.password "%s"
+rcon.web 1
+server.identity "corrosion"
+server.saveinterval 300
+`, cfg.ServerName, cfg.MaxPlayers, cfg.WorldSize, cfg.Seed,
+		cfg.ServerPort, cfg.RconPort, cfg.RconPassword)
+
+	cfgPath := filepath.Join(cfgDir, "server.cfg")
+
+	if err := os.WriteFile(cfgPath, []byte(content), 0644); err != nil {
+		return fmt.Errorf("failed to write server.cfg to %s: %w", cfgPath, err)
+	}
+
+	return nil
+}

companion-agent/internal/deploy/deploy.go

@@ -0,0 +1,180 @@
+package deploy
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"time"
+
+	"github.com/nats-io/nats.go"
+)
+
+// GameServerStarter abstracts the game server process manager so the deployer
+// can set the executable path and start the server without depending on the
+// concrete process.GameServer type. The existing GameServer will implement
+// UpdatePath in a separate task.
+type GameServerStarter interface {
+	Start() error
+	UpdatePath(path string)
+}
+
+// Deployer orchestrates one-click Rust server deployment. It downloads SteamCMD,
+// installs the Rust Dedicated Server, generates server.cfg, and starts the server
+// process — publishing progress updates to NATS at each stage so the frontend can
+// display real-time deployment status.
+type Deployer struct {
+	nc         *nats.Conn
+	licenseID  string
+	installDir string
+	gameServer GameServerStarter
+}
+
+// NewDeployer creates a new Deployer instance.
+func NewDeployer(nc *nats.Conn, licenseID, installDir string, gs GameServerStarter) *Deployer {
+	return &Deployer{
+		nc:         nc,
+		licenseID:  licenseID,
+		installDir: installDir,
+		gameServer: gs,
+	}
+}
+
+// Deploy executes the full deployment pipeline: SteamCMD install, Rust server
+// download, config generation, and server startup. If any stage fails, a "failed"
+// status is published and the error is returned. Progress updates are published
+// to NATS at each stage transition.
+func (d *Deployer) Deploy(cfg DeployConfig) error {
+	// Stage 1: SteamCMD
+	log.Printf("Deploy: starting SteamCMD installation for license %s", d.licenseID)
+	d.publishStatus("downloading_steamcmd", 0, "Checking for existing SteamCMD installation...")
+
+	steamcmdPath, err := InstallSteamCMD(d.installDir)
+	if err != nil {
+		d.publishStatus("failed", 0, "SteamCMD installation failed", err.Error())
+		return fmt.Errorf("steamcmd install failed: %w", err)
+	}
+
+	log.Printf("Deploy: SteamCMD ready at %s", steamcmdPath)
+	d.publishStatus("downloading_steamcmd", 100, "SteamCMD ready")
+
+	// Stage 2: Download Rust Dedicated Server
+	log.Printf("Deploy: downloading Rust Dedicated Server via SteamCMD")
+	d.publishStatus("downloading_rust", 0, "Downloading Rust Dedicated Server via SteamCMD...")
+
+	if err := DownloadRustServer(steamcmdPath, d.installDir); err != nil {
+		d.publishStatus("failed", 0, "Rust server download failed", err.Error())
+		return fmt.Errorf("rust server download failed: %w", err)
+	}
+
+	log.Printf("Deploy: Rust Dedicated Server installed")
+	d.publishStatus("downloading_rust", 100, "Rust Dedicated Server installed")
+
+	// Stage 3: Generate server.cfg
+	log.Printf("Deploy: generating server.cfg")
+	d.publishStatus("configuring", 0, "Generating server.cfg...")
+
+	if err := GenerateServerCfg(d.installDir, cfg); err != nil {
+		d.publishStatus("failed", 0, "Server configuration failed", err.Error())
+		return fmt.Errorf("config generation failed: %w", err)
+	}
+
+	log.Printf("Deploy: server.cfg written")
+	d.publishStatus("configuring", 100, "Server configured")
+
+	// Stage 4: Start the server
+	log.Printf("Deploy: starting Rust server")
+	d.publishStatus("starting", 0, "Starting Rust server...")
+
+	var exePath string
+	switch runtime.GOOS {
+	case "windows":
+		exePath = filepath.Join(d.installDir, "server", "RustDedicated.exe")
+	default:
+		exePath = filepath.Join(d.installDir, "server", "RustDedicated")
+	}
+
+	d.gameServer.UpdatePath(exePath)
+
+	if err := d.gameServer.Start(); err != nil {
+		d.publishStatus("failed", 0, "Server failed to start", err.Error())
+		return fmt.Errorf("server start failed: %w", err)
+	}
+
+	log.Printf("Deploy: Rust server is now running")
+	d.publishStatus("online", 100, "Rust server is now running")
+
+	return nil
+}
+
+// DownloadRustServer runs SteamCMD to download/update the Rust Dedicated Server
+// (App ID 258550) into {installDir}/server. This function is platform-agnostic —
+// it simply executes the steamcmd binary which was installed by the platform-specific
+// InstallSteamCMD function.
+func DownloadRustServer(steamcmdPath, installDir string) error {
+	serverDir := filepath.Join(installDir, "server")
+
+	log.Printf("Downloading Rust Dedicated Server to %s", serverDir)
+
+	cmd := exec.Command(steamcmdPath,
+		"+login", "anonymous",
+		"+force_install_dir", serverDir,
+		"+app_update", "258550", "validate",
+		"+quit",
+	)
+
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("steamcmd app_update 258550 failed: %w", err)
+	}
+
+	return nil
+}
+
+// CheckServerInstalled returns true if the Rust Dedicated Server executable
+// exists at the expected path within the install directory.
+func CheckServerInstalled(installDir string) bool {
+	var exePath string
+	switch runtime.GOOS {
+	case "windows":
+		exePath = filepath.Join(installDir, "server", "RustDedicated.exe")
+	default:
+		exePath = filepath.Join(installDir, "server", "RustDedicated")
+	}
+
+	_, err := os.Stat(exePath)
+	return err == nil
+}
+
+// publishStatus publishes a DeployStatus message to the NATS subject
+// corrosion.{licenseID}.deploy.status. Publish errors are logged but do not
+// fail the deployment — losing a progress update is not fatal.
+func (d *Deployer) publishStatus(stage string, progress int, message string, errDetail ...string) {
+	subject := fmt.Sprintf("corrosion.%s.deploy.status", d.licenseID)
+
+	status := DeployStatus{
+		Stage:     stage,
+		Progress:  progress,
+		Message:   message,
+		Timestamp: time.Now().UTC().Format(time.RFC3339),
+	}
+
+	if len(errDetail) > 0 && errDetail[0] != "" {
+		status.Error = errDetail[0]
+	}
+
+	data, err := json.Marshal(status)
+	if err != nil {
+		log.Printf("Failed to marshal deploy status: %v", err)
+		return
+	}
+
+	if err := d.nc.Publish(subject, data); err != nil {
+		log.Printf("Failed to publish deploy status to %s: %v", subject, err)
+	}
+}

companion-agent/internal/deploy/deploy_linux.go

@@ -0,0 +1,127 @@
+//go:build linux
+
+package deploy
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+// InstallSteamCMD downloads and installs SteamCMD for Linux into the given
+// install directory. If SteamCMD is already present it returns the existing
+// path without re-downloading. The returned string is the absolute path to
+// the steamcmd.sh executable.
+func InstallSteamCMD(installDir string) (string, error) {
+	steamcmdDir := filepath.Join(installDir, "steamcmd")
+	steamcmdPath := filepath.Join(steamcmdDir, "steamcmd.sh")
+
+	// Already installed — nothing to do.
+	if _, err := os.Stat(steamcmdPath); err == nil {
+		log.Printf("SteamCMD already installed at %s", steamcmdPath)
+		return steamcmdPath, nil
+	}
+
+	if err := os.MkdirAll(steamcmdDir, 0755); err != nil {
+		return "", fmt.Errorf("failed to create steamcmd directory %s: %w", steamcmdDir, err)
+	}
+
+	// Download the Linux tarball.
+	tarball := filepath.Join(steamcmdDir, "steamcmd_linux.tar.gz")
+	if err := downloadFile("https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz", tarball); err != nil {
+		return "", fmt.Errorf("failed to download steamcmd: %w", err)
+	}
+
+	// Extract with tar.
+	cmd := exec.Command("tar", "-xzf", "steamcmd_linux.tar.gz")
+	cmd.Dir = steamcmdDir
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return "", fmt.Errorf("failed to extract steamcmd: %w — output: %s", err, string(out))
+	}
+
+	// Ensure the script is executable.
+	if err := os.Chmod(steamcmdPath, 0755); err != nil {
+		return "", fmt.Errorf("failed to chmod steamcmd.sh: %w", err)
+	}
+
+	// Verify the installation by running +quit (triggers first-time setup).
+	verify := exec.Command(steamcmdPath, "+quit")
+	verify.Dir = steamcmdDir
+	if out, err := verify.CombinedOutput(); err != nil {
+		return "", fmt.Errorf("steamcmd verification failed: %w — output: %s", err, string(out))
+	}
+
+	log.Printf("SteamCMD installed successfully at %s", steamcmdPath)
+	return steamcmdPath, nil
+}
+
+// RegisterService creates a systemd unit file for the Rust Dedicated Server
+// and enables it. If the caller does not have root access, the unit file is
+// written into installDir as a fallback so the user can install it manually.
+func RegisterService(installDir string, cfg DeployConfig) error {
+	serverPath := filepath.Join(installDir, "server", "RustDedicated")
+
+	unit := fmt.Sprintf(`[Unit]
+Description=Rust Dedicated Server (Corrosion Managed)
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=%s/server
+ExecStart=%s -batchmode +server.hostname "%s" +server.port %d +rcon.port %d +rcon.password "%s" +rcon.web 1 +server.identity "corrosion" +server.maxplayers %d +server.worldsize %d +server.seed %d
+Restart=on-failure
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target
+`, installDir, serverPath, cfg.ServerName, cfg.ServerPort, cfg.RconPort,
+		cfg.RconPassword, cfg.MaxPlayers, cfg.WorldSize, cfg.Seed)
+
+	systemdPath := "/etc/systemd/system/rustserver.service"
+	if err := os.WriteFile(systemdPath, []byte(unit), 0644); err != nil {
+		// Fallback — write into installDir so the user can place it manually.
+		fallback := filepath.Join(installDir, "rustserver.service")
+		log.Printf("WARNING: cannot write to %s (%v), falling back to %s", systemdPath, err, fallback)
+		if writeErr := os.WriteFile(fallback, []byte(unit), 0644); writeErr != nil {
+			return fmt.Errorf("failed to write service file to fallback %s: %w", fallback, writeErr)
+		}
+	}
+
+	// Best-effort daemon-reload and enable — ignore errors (systemctl may not
+	// exist or the user may lack privileges).
+	_ = exec.Command("systemctl", "daemon-reload").Run()
+	_ = exec.Command("systemctl", "enable", "rustserver").Run()
+
+	log.Println("Systemd service registered for rustserver")
+	return nil
+}
+
+// downloadFile fetches url and writes the response body to dest on disk.
+func downloadFile(url, dest string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return fmt.Errorf("GET %s failed: %w", url, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("GET %s returned status %d", url, resp.StatusCode)
+	}
+
+	out, err := os.Create(dest)
+	if err != nil {
+		return fmt.Errorf("failed to create file %s: %w", dest, err)
+	}
+	defer out.Close()
+
+	if _, err := io.Copy(out, resp.Body); err != nil {
+		return fmt.Errorf("failed to write to %s: %w", dest, err)
+	}
+
+	return nil
+}

companion-agent/internal/deploy/deploy_windows.go

@@ -0,0 +1,145 @@
+//go:build windows
+
+package deploy
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+// InstallSteamCMD downloads and installs SteamCMD for Windows into the given
+// install directory. If SteamCMD is already present it returns the existing
+// path without re-downloading. The returned string is the absolute path to
+// steamcmd.exe.
+func InstallSteamCMD(installDir string) (string, error) {
+	steamcmdDir := filepath.Join(installDir, "steamcmd")
+	steamcmdPath := filepath.Join(steamcmdDir, "steamcmd.exe")
+
+	// Already installed — nothing to do.
+	if _, err := os.Stat(steamcmdPath); err == nil {
+		log.Printf("SteamCMD already installed at %s", steamcmdPath)
+		return steamcmdPath, nil
+	}
+
+	if err := os.MkdirAll(steamcmdDir, 0755); err != nil {
+		return "", fmt.Errorf("failed to create steamcmd directory %s: %w", steamcmdDir, err)
+	}
+
+	// Download the Windows zip.
+	zipPath := filepath.Join(steamcmdDir, "steamcmd.zip")
+	if err := downloadFile("https://steamcdn-a.akamaihd.net/client/installer/steamcmd.zip", zipPath); err != nil {
+		return "", fmt.Errorf("failed to download steamcmd: %w", err)
+	}
+
+	// Extract the zip into steamcmdDir.
+	if err := extractZip(zipPath, steamcmdDir); err != nil {
+		return "", fmt.Errorf("failed to extract steamcmd.zip: %w", err)
+	}
+
+	// Verify the exe landed where expected.
+	if _, err := os.Stat(steamcmdPath); err != nil {
+		return "", fmt.Errorf("steamcmd.exe not found after extraction: %w", err)
+	}
+
+	log.Printf("SteamCMD installed successfully at %s", steamcmdPath)
+	return steamcmdPath, nil
+}
+
+// RegisterService creates a Windows service for the Rust Dedicated Server
+// using sc.exe. If the caller does not have administrator privileges the
+// command will fail silently with a warning log.
+func RegisterService(installDir string, cfg DeployConfig) error {
+	serverPath := filepath.Join(installDir, "server", "RustDedicated.exe")
+
+	binPath := fmt.Sprintf(`"%s" -batchmode +server.hostname "%s" +server.port %d +rcon.port %d +rcon.password "%s" +rcon.web 1 +server.identity "corrosion" +server.maxplayers %d +server.worldsize %d +server.seed %d`,
+		serverPath, cfg.ServerName, cfg.ServerPort, cfg.RconPort,
+		cfg.RconPassword, cfg.MaxPlayers, cfg.WorldSize, cfg.Seed)
+
+	cmd := exec.Command("sc.exe", "create", "RustServer", "binPath=", binPath, "start=", "auto")
+	if out, err := cmd.CombinedOutput(); err != nil {
+		log.Printf("WARNING: sc.exe create failed (may require admin): %v — output: %s", err, string(out))
+	} else {
+		log.Println("Windows service RustServer registered successfully")
+	}
+
+	return nil
+}
+
+// downloadFile fetches url and writes the response body to dest on disk.
+func downloadFile(url, dest string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return fmt.Errorf("GET %s failed: %w", url, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("GET %s returned status %d", url, resp.StatusCode)
+	}
+
+	out, err := os.Create(dest)
+	if err != nil {
+		return fmt.Errorf("failed to create file %s: %w", dest, err)
+	}
+	defer out.Close()
+
+	if _, err := io.Copy(out, resp.Body); err != nil {
+		return fmt.Errorf("failed to write to %s: %w", dest, err)
+	}
+
+	return nil
+}
+
+// extractZip extracts all files from a zip archive into destDir, preserving
+// the directory structure from the archive.
+func extractZip(zipPath, destDir string) error {
+	r, err := zip.OpenReader(zipPath)
+	if err != nil {
+		return fmt.Errorf("failed to open zip %s: %w", zipPath, err)
+	}
+	defer r.Close()
+
+	for _, f := range r.File {
+		target := filepath.Join(destDir, f.Name)
+
+		if f.FileInfo().IsDir() {
+			if err := os.MkdirAll(target, 0755); err != nil {
+				return fmt.Errorf("failed to create directory %s: %w", target, err)
+			}
+			continue
+		}
+
+		// Ensure the parent directory exists.
+		if err := os.MkdirAll(filepath.Dir(target), 0755); err != nil {
+			return fmt.Errorf("failed to create parent dir for %s: %w", target, err)
+		}
+
+		rc, err := f.Open()
+		if err != nil {
+			return fmt.Errorf("failed to open zip entry %s: %w", f.Name, err)
+		}
+
+		outFile, err := os.Create(target)
+		if err != nil {
+			rc.Close()
+			return fmt.Errorf("failed to create file %s: %w", target, err)
+		}
+
+		if _, err := io.Copy(outFile, rc); err != nil {
+			outFile.Close()
+			rc.Close()
+			return fmt.Errorf("failed to extract %s: %w", f.Name, err)
+		}
+
+		outFile.Close()
+		rc.Close()
+	}
+
+	return nil
+}

frontend/src/views/admin/ServerView.vue

@@ -17,8 +17,6 @@ import {
   Rocket,
   AlertTriangle,
   Check,
-  ClipboardCopy,
-  ChevronRight,
 } from 'lucide-vue-next'
 import type { DeploymentConfig, DeploymentStatus } from '@/types'
 import { useWebSocket } from '@/composables/useWebSocket'
@@ -194,9 +192,9 @@ onMounted(async () => {
   loadFormFromConfig()
 
   const ws = useWebSocket()
-  ws.on('event', (data: any) => {
+  ws.subscribe((msg) => {
-    if (data.event === 'deploy_status') {
+    if (msg.type === 'event' && msg.event === 'deploy_status') {
-      server.updateDeploymentStatus(data.data as DeploymentStatus)
+      server.updateDeploymentStatus(msg.data as DeploymentStatus)
     }
   })
 })