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/cmd/controller/main.go

@@ -569,6 +569,11 @@ func main() {
 
 	// --- Initialize API router ---
 	apiRouter := api.NewRouter(cfg, *configPath, sett, stackMgr, syncer, cpuCollector, backupMgr, crossDriveRunner, metricsStore, updater, notifier, logger)
+	if hubPusher != nil {
+		apiRouter.OnConfigApplied = func() {
+			pushInfraBackup(cfg, sett, stackProv, hubPusher, logger)
+		}
+	}
 
 	// --- Initialize web server ---
 	webServer := web.NewServer(cfg, stackMgr, cpuCollector, backupMgr, crossDriveRunner, sched, sett, alertMgr, notifier, updater, logger, Version)