fix(panel): real auto-updating version + remove fake agent footer; rename companion -> Corrosion host agent

Version badge: was hardcoded '1.0.8' — now single-sourced from frontend/package.json (1.0.0) via Vite define __APP_VERSION__, so it auto-updates on release. Sidebar agent footer: removed the FABRICATED 'asgard-01' host name and the fake 'Agent v1.0.8' line — now shows real server.connection data, or an honest 'No host agent connected' empty state when nothing is deployed (the operator's actual state). Renamed 'Companion agent' -> 'Corrosion host agent' across the UI (ServerView/SetupWizard/Dashboard/Plugins), the binary names (corrosion-host-agent-<os>-<arch>) + CDN path (/host-agent/), the Go Makefile build output, and the Gitea CI workflow — frontend download links and CI output now match. Marketing hero mock host names neutralized (asgard-01 -> rust-host/dune-host/conan-host). DB column names (companion_last_seen) left intact. Build green; zero 'asgard'/'1.0.8' remain in frontend/src.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/views/admin/ServerView.vue

@@ -100,22 +100,22 @@ const agentLastSeenLabel = computed(() => {
 const licenseKey = computed(() => auth.license?.license_key || 'YOUR-LICENSE-KEY')
 
 const linuxCommands = computed(() => `# Download the agent
-curl -LO https://cdn.corrosionmgmt.com/companion/latest/corrosion-companion-linux-amd64
-chmod +x corrosion-companion-linux-amd64
+curl -LO https://cdn.corrosionmgmt.com/host-agent/latest/corrosion-host-agent-linux-amd64
+chmod +x corrosion-host-agent-linux-amd64
 
 # Start with your license key
 export LICENSE_ID="${licenseKey.value}"
 export NATS_URL="nats://nats.corrosionmgmt.com:4222"
-./corrosion-companion-linux-amd64`)
+./corrosion-host-agent-linux-amd64`)
 
 const windowsCommands = computed(() => `# Requires PowerShell (not Command Prompt)
 # Download the agent
-Invoke-WebRequest -Uri "https://cdn.corrosionmgmt.com/companion/latest/corrosion-companion-windows-amd64.exe" -OutFile "corrosion-companion-windows-amd64.exe"
+Invoke-WebRequest -Uri "https://cdn.corrosionmgmt.com/host-agent/latest/corrosion-host-agent-windows-amd64.exe" -OutFile "corrosion-host-agent-windows-amd64.exe"
 
 # Start with your license key
 $env:LICENSE_ID="${licenseKey.value}"
 $env:NATS_URL="nats://nats.corrosionmgmt.com:4222"
-.\\corrosion-companion-windows-amd64.exe`)
+.\\corrosion-host-agent-windows-amd64.exe`)
 
 async function copySetupCommands() {
   try {
@@ -387,8 +387,8 @@ onMounted(async () => {
       </div>
     </Panel>
 
-    <!-- Companion agent -->
-    <Panel title="Companion agent" subtitle="Bare-metal server management binary">
+    <!-- Host agent -->
+    <Panel title="Host agent" subtitle="Bare-metal server management binary">
       <template #actions>
         <Badge :tone="isAgentConnected ? 'online' : 'offline'" :dot="true" :pulse="isAgentConnected">
           {{ isAgentConnected ? 'Active' : 'Inactive' }}
@@ -417,20 +417,20 @@ onMounted(async () => {
       <!-- Download -->
       <div class="sv__section-head">
         <Icon name="download" :size="14" />
-        <span>Download companion agent</span>
+        <span>Download host agent</span>
       </div>
       <div class="sv__downloads sv__mb">
         <a
-          href="https://cdn.corrosionmgmt.com/companion/latest/corrosion-companion-linux-amd64"
-          download="corrosion-companion-linux-amd64"
+          href="https://cdn.corrosionmgmt.com/host-agent/latest/corrosion-host-agent-linux-amd64"
+          download="corrosion-host-agent-linux-amd64"
           class="sv__dl-link"
         >
           <Icon name="download" :size="15" />
           Linux (amd64)
         </a>
         <a
-          href="https://cdn.corrosionmgmt.com/companion/latest/corrosion-companion-windows-amd64.exe"
-          download="corrosion-companion-windows-amd64.exe"
+          href="https://cdn.corrosionmgmt.com/host-agent/latest/corrosion-host-agent-windows-amd64.exe"
+          download="corrosion-host-agent-windows-amd64.exe"
           class="sv__dl-link"
         >
           <Icon name="download" :size="15" />
@@ -461,23 +461,23 @@ onMounted(async () => {
       <!-- Linux commands -->
       <div v-if="setupTab === 'linux'" class="sv__codeblock">
         <p class="sv__cmt"># Download the agent</p>
-        <p>curl -LO https://cdn.corrosionmgmt.com/companion/latest/corrosion-companion-linux-amd64</p>
-        <p>chmod +x corrosion-companion-linux-amd64</p>
+        <p>curl -LO https://cdn.corrosionmgmt.com/host-agent/latest/corrosion-host-agent-linux-amd64</p>
+        <p>chmod +x corrosion-host-agent-linux-amd64</p>
         <p class="sv__cmt sv__mt">&#x23; Start with your license key</p>
         <p>export LICENSE_ID=<span class="sv__accent">"{{ licenseKey }}"</span></p>
         <p>export NATS_URL=<span class="sv__accent">"nats://nats.corrosionmgmt.com:4222"</span></p>
-        <p>./corrosion-companion-linux-amd64</p>
+        <p>./corrosion-host-agent-linux-amd64</p>
       </div>
 
       <!-- Windows commands -->
       <div v-if="setupTab === 'windows'" class="sv__codeblock">
         <p class="sv__cmt"># Requires PowerShell (not Command Prompt)</p>
         <p class="sv__cmt"># Download the agent</p>
-        <p>Invoke-WebRequest -Uri <span class="sv__accent">"https://cdn.corrosionmgmt.com/companion/latest/corrosion-companion-windows-amd64.exe"</span> -OutFile <span class="sv__accent">"corrosion-companion-windows-amd64.exe"</span></p>
+        <p>Invoke-WebRequest -Uri <span class="sv__accent">"https://cdn.corrosionmgmt.com/host-agent/latest/corrosion-host-agent-windows-amd64.exe"</span> -OutFile <span class="sv__accent">"corrosion-host-agent-windows-amd64.exe"</span></p>
         <p class="sv__cmt sv__mt">&#x23; Start with your license key</p>
         <p>$env:LICENSE_ID=<span class="sv__accent">"{{ licenseKey }}"</span></p>
         <p>$env:NATS_URL=<span class="sv__accent">"nats://nats.corrosionmgmt.com:4222"</span></p>
-        <p>.\corrosion-companion-windows-amd64.exe</p>
+        <p>.\corrosion-host-agent-windows-amd64.exe</p>
       </div>
     </Panel>
 
@@ -609,7 +609,7 @@ onMounted(async () => {
       <EmptyState
         icon="box"
         title="Docker-managed deployment"
-        :description="profile.label + ' servers are managed via Docker Compose. Connect the companion agent on your Docker host to enable lifecycle management.'"
+        :description="profile.label + ' servers are managed via Docker Compose. Connect the host agent on your Docker host to enable lifecycle management.'"
       >
         <template #action>
           <Badge tone="info">Docker · Compose</Badge>
@@ -724,7 +724,7 @@ onMounted(async () => {
       <EmptyState
         icon="network"
         title="Cluster management coming soon"
-        :description="'Connect a ' + profile.label + ' host to manage the main-client cluster from this panel. Cluster configuration requires the companion agent.'"
+        :description="'Connect a ' + profile.label + ' host to manage the main-client cluster from this panel. Cluster configuration requires the host agent.'"
       />
     </Panel>
 
@@ -737,7 +737,7 @@ onMounted(async () => {
       <EmptyState
         icon="map"
         title="Sietch management requires a connected Dune host"
-        description="Connect the companion agent on your Dune: Awakening Docker host to manage BattleGroups and Sietches from this panel."
+        description="Connect the host agent on your Dune: Awakening Docker host to manage BattleGroups and Sietches from this panel."
       />
     </Panel>