fix: Clean up Quick Setup — remove NATS_TOKEN, auto-populate license key

NATS has no auth configured, so NATS_TOKEN was a placeholder that
confused users. Made it optional in the Go agent (default empty) and
removed it from Quick Setup commands. Also removed GAME_SERVER_PATH
since one-click deploy handles server installation. License key already
auto-populates from auth store after previous commit.

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

companion-agent/cmd/agent/main.go

@@ -18,7 +18,7 @@ import (
 type Config struct {
 	// NATS connection
 	NATSUrl   string `envconfig:"NATS_URL" required:"true"`
-	NATSToken string `envconfig:"NATS_TOKEN" required:"true"`
+	NATSToken string `envconfig:"NATS_TOKEN" default:""`
 
 	// License identification
 	LicenseID string `envconfig:"LICENSE_ID" required:"true"`

companion-agent/internal/client/nats.go

@@ -7,13 +7,12 @@ import (
 	"github.com/nats-io/nats.go"
 )
 
-// Connect establishes a connection to NATS with token authentication
+// Connect establishes a connection to NATS with optional token authentication
 // and automatic reconnection handling
 func Connect(url, token string) (*nats.Conn, error) {
 	opts := []nats.Option{
-		nats.Token(token),
 		nats.Name("corrosion-companion"),
-		nats.MaxReconnects(-1), // Unlimited reconnect attempts
+		nats.MaxReconnects(-1),
 		nats.ReconnectWait(2 * time.Second),
 		nats.DisconnectErrHandler(func(nc *nats.Conn, err error) {
 			if err != nil {
@@ -31,6 +30,11 @@ func Connect(url, token string) (*nats.Conn, error) {
 		}),
 	}
 
+	// Only use token auth if a token is provided
+	if token != "" {
+		opts = append(opts, nats.Token(token))
+	}
+
 	nc, err := nats.Connect(url, opts...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to connect to NATS: %w", err)