feat: deployed app removal + missing field injection (v0.19.0)

Add "Eltávolítás" to remove deployed (non-orphaned) stacks — reverts
them to "Nincs telepítve" while preserving templates for redeploy.
Modal offers HDD data and backup data cleanup choices.

Auto-inject missing deploy fields (secrets, domains) into existing
app.yaml when templates are updated via sync or on controller startup.

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

controller/cmd/controller/main.go

@@ -155,8 +155,15 @@ func main() {
 		logger.Printf("[WARN] Initial stack scan failed: %v", err)
 	}
 
+	// Inject missing deploy fields for all deployed stacks on startup
+	if names := stackMgr.DeployedStackNames(); len(names) > 0 {
+		stackMgr.InjectMissingFields(names)
+	}
+
 	// --- Initialize catalog syncer ---
-	syncer := catalogsync.New(cfg, logger, stackMgr.ScanStacks)
+	syncer := catalogsync.New(cfg, logger, stackMgr.ScanStacks, func(updated []string) {
+		stackMgr.InjectMissingFields(updated)
+	})
 	syncer.Start()
 	defer syncer.Stop()