fix: skip update check for source builds and show appropriate UI message

Source builds use commit hashes (main-c147fa1) not semantic versions
(v4.23.0), so update checks would always fail or show misleading
"Update Available" banners.

Changes:
- Add IsSourceBuild flag to VersionInfo struct
- Detect source builds via BUILD_FROM_SOURCE marker file
- Skip update check for source builds (like Docker)
- Update frontend to show "Built from source" message
- Disable manual update check button for source builds
- Return "source" deployment type for source builds

Backend:
- internal/updates/version.go: Add isSourceBuildEnvironment() detection
- internal/updates/manager.go: Skip check with appropriate message
- internal/api/types.go: Add isSourceBuild to API response
- internal/api/router.go: Include isSourceBuild in version endpoint

Frontend:
- src/api/updates.ts: Add isSourceBuild to VersionInfo type
- src/stores/updates.ts: Don't poll for updates on source builds
- src/components/Settings/Settings.tsx: Show "Built from source" message

Fixes the confusing "Update Available" banner for users who explicitly
chose --source to get latest main branch code.

Co-authored-by: Codex AI

frontend-modern/src/api/updates.ts

@@ -26,6 +26,7 @@ export interface VersionInfo {
   runtime: string;
   channel?: string;
   isDocker: boolean;
+  isSourceBuild: boolean;
   isDevelopment: boolean;
   deploymentType?: string;
 }

frontend-modern/src/components/Settings/Settings.tsx

@@ -3257,9 +3257,13 @@ const Settings: Component<SettingsProps> = (props) => {
                           <button
                             type="button"
                             onClick={checkForUpdates}
-                            disabled={checkingForUpdates() || versionInfo()?.isDocker}
+                            disabled={
+                              checkingForUpdates() ||
+                              versionInfo()?.isDocker ||
+                              versionInfo()?.isSourceBuild
+                            }
                             class={`px-4 py-2 text-sm rounded-lg transition-colors flex items-center gap-2 ${
-                              versionInfo()?.isDocker
+                              versionInfo()?.isDocker || versionInfo()?.isSourceBuild
                                 ? 'bg-gray-100 dark:bg-gray-700 text-gray-400 dark:text-gray-500 cursor-not-allowed'
                                 : 'bg-blue-600 text-white hover:bg-blue-700'
                             }`}
@@ -3284,6 +3288,15 @@ const Settings: Component<SettingsProps> = (props) => {
                           </div>
                         </Show>
 
+                        <Show when={versionInfo()?.isSourceBuild}>
+                          <div class="p-3 bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 rounded-lg">
+                            <p class="text-xs text-blue-800 dark:text-blue-200">
+                              <strong>Built from source:</strong> Pull the latest code from git and
+                              rebuild to update.
+                            </p>
+                          </div>
+                        </Show>
+
                         <Show when={Boolean(updateInfo()?.warning)}>
                           <div class="p-3 bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-700 rounded-lg">
                             <p class="text-xs text-amber-800 dark:text-amber-200">

frontend-modern/src/stores/updates.ts

@@ -100,7 +100,7 @@ const checkForUpdates = async (force = false): Promise<void> => {
     }
 
     // Don't check for updates in Docker or development builds
-    if (version.isDocker || version.isDevelopment) {
+    if (version.isDocker || version.isDevelopment || version.isSourceBuild) {
       setUpdateAvailable(false);
       setUpdateInfo(null);
       return;

internal/api/router.go

@@ -2244,6 +2244,7 @@ func (r *Router) handleVersion(w http.ResponseWriter, req *http.Request) {
 			Runtime:       runtime.Version(),
 			Channel:       "stable",
 			IsDocker:      false,
+			IsSourceBuild: false,
 			IsDevelopment: true,
 		}
 		w.Header().Set("Content-Type", "application/json")
@@ -2260,6 +2261,7 @@ func (r *Router) handleVersion(w http.ResponseWriter, req *http.Request) {
 		Runtime:        versionInfo.Runtime,
 		Channel:        versionInfo.Channel,
 		IsDocker:       versionInfo.IsDocker,
+		IsSourceBuild:  versionInfo.IsSourceBuild,
 		IsDevelopment:  versionInfo.IsDevelopment,
 		DeploymentType: versionInfo.DeploymentType,
 	}

internal/api/types.go

@@ -29,6 +29,7 @@ type VersionResponse struct {
 	Runtime         string `json:"runtime,omitempty"`
 	Channel         string `json:"channel,omitempty"`
 	IsDocker        bool   `json:"isDocker"`
+	IsSourceBuild   bool   `json:"isSourceBuild"`
 	IsDevelopment   bool   `json:"isDevelopment"`
 	DeploymentType  string `json:"deploymentType,omitempty"`
 	UpdateAvailable bool   `json:"updateAvailable"`

internal/updates/manager.go

@@ -164,6 +164,23 @@ func (m *Manager) CheckForUpdatesWithChannel(ctx context.Context, channel string
 		return info, nil
 	}
 
+	// Skip update check for source builds
+	if currentInfo.IsSourceBuild {
+		info := &UpdateInfo{
+			Available:      false,
+			CurrentVersion: currentInfo.Version,
+			LatestVersion:  currentInfo.Version,
+		}
+		if useCache {
+			m.statusMu.Lock()
+			m.checkCache[channel] = info
+			m.cacheTime[channel] = time.Now()
+			m.statusMu.Unlock()
+		}
+		m.updateStatus("idle", 0, "Updates not available for source builds")
+		return info, nil
+	}
+
 	// Parse current version first
 	currentVer, err := ParseVersion(currentInfo.Version)
 	if err != nil {

internal/updates/version.go

@@ -28,6 +28,7 @@ type VersionInfo struct {
 	Runtime        string `json:"runtime"`
 	Channel        string `json:"channel,omitempty"`
 	IsDocker       bool   `json:"isDocker"`
+	IsSourceBuild  bool   `json:"isSourceBuild"`
 	IsDevelopment  bool   `json:"isDevelopment"`
 	DeploymentType string `json:"deploymentType"`
 }
@@ -128,6 +129,7 @@ func GetCurrentVersion() (*VersionInfo, error) {
 			Channel:        detectChannelFromVersion(normalized),
 			IsDevelopment:  isDev,
 			IsDocker:       isDockerEnvironment(),
+			IsSourceBuild:  isSourceBuildEnvironment(),
 			DeploymentType: GetDeploymentType(),
 		}
 	}
@@ -287,6 +289,23 @@ func isDockerEnvironment() bool {
 	return false
 }
 
+// isSourceBuildEnvironment checks if running from a source build
+func isSourceBuildEnvironment() bool {
+	markerPaths := []string{
+		"BUILD_FROM_SOURCE",
+		"/opt/pulse/BUILD_FROM_SOURCE",
+		filepath.Join(filepath.Dir(os.Args[0]), "BUILD_FROM_SOURCE"),
+	}
+
+	for _, path := range markerPaths {
+		if fileExists(path) {
+			return true
+		}
+	}
+
+	return false
+}
+
 // fileExists checks if a file exists
 func fileExists(path string) bool {
 	// Use os.Stat instead of exec.Command for better performance and reliability
@@ -301,6 +320,10 @@ func GetDeploymentType() string {
 		return "docker"
 	}
 
+	if isSourceBuildEnvironment() {
+		return "source"
+	}
+
 	// Check for ProxmoxVE LXC installation (has update command)
 	if fileExists("/bin/update") {
 		// Read file directly instead of using exec.Command