v0.21.3: Push infra backup after config apply, fix double-v in events

After successful config apply, immediately push infra backup to Hub
so the config sync status updates right away. Also fix startup event
message that showed "vv0.21.2" instead of "v0.21.3".

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

controller/internal/api/router.go

@@ -38,6 +38,9 @@ type Router struct {
 	updater          *selfupdate.Updater
 	notifier         *notify.Notifier
 	logger           *log.Logger
+
+	// OnConfigApplied is called after a successful config apply (e.g., to push infra backup).
+	OnConfigApplied func()
 }
 
 func NewRouter(cfg *config.Config, configPath string, sett *settings.Settings, stackMgr *stacks.Manager, syncer *catalogsync.Syncer, cpuCollector *system.CPUCollector, backupMgr *backup.Manager, crossDrive *backup.CrossDriveRunner, metricsStore *metrics.MetricsStore, updater *selfupdate.Updater, notif *notify.Notifier, logger *log.Logger) *Router {
@@ -976,6 +979,11 @@ func (r *Router) configApply(w http.ResponseWriter, req *http.Request) {
 
 	r.logger.Printf("[API] Config applied from Hub (%d bytes), restart needed to take effect", len(body))
 	writeJSON(w, http.StatusOK, apiResponse{OK: true, Message: "Config applied. Restart controller to apply changes."})
+
+	// Push updated infra backup so Hub has fresh config data immediately
+	if r.OnConfigApplied != nil {
+		go r.OnConfigApplied()
+	}
 }
 
 func (r *Router) configHash(w http.ResponseWriter, _ *http.Request) {