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/internal/sync/sync.go

@@ -18,15 +18,16 @@ import (
 
 // Syncer handles periodic git sync of the app catalog to the local stacks directory.
 type Syncer struct {
-	cfg       *config.Config
-	logger    *log.Logger
-	cacheDir  string // local git clone
-	rescanFn  func() error
-	mu        sync.Mutex
-	lastSync  time.Time
-	lastErr   error
-	syncing   bool
-	stopCh    chan struct{}
+	cfg          *config.Config
+	logger       *log.Logger
+	cacheDir     string // local git clone
+	rescanFn     func() error
+	postSyncHook func(updated []string) // called after sync with names of updated stacks
+	mu           sync.Mutex
+	lastSync     time.Time
+	lastErr      error
+	syncing      bool
+	stopCh       chan struct{}
 }
 
 // SyncStatus holds information about the last sync operation.
@@ -46,14 +47,16 @@ type SyncResult struct {
 }
 
 // New creates a new Syncer. rescanFn is called after a successful sync to trigger ScanStacks().
-func New(cfg *config.Config, logger *log.Logger, rescanFn func() error) *Syncer {
+// postSyncHook is called with names of updated stacks (may be nil).
+func New(cfg *config.Config, logger *log.Logger, rescanFn func() error, postSyncHook func([]string)) *Syncer {
 	cacheDir := filepath.Join(cfg.Paths.DataDir, "catalog-cache")
 	return &Syncer{
-		cfg:      cfg,
-		logger:   logger,
-		cacheDir: cacheDir,
-		rescanFn: rescanFn,
-		stopCh:   make(chan struct{}),
+		cfg:          cfg,
+		logger:       logger,
+		cacheDir:     cacheDir,
+		rescanFn:     rescanFn,
+		postSyncHook: postSyncHook,
+		stopCh:       make(chan struct{}),
 	}
 }
 
@@ -187,6 +190,11 @@ func (s *Syncer) doSync() SyncResult {
 		}
 	}
 
+	// Step 4: Inject missing deploy fields for updated stacks
+	if len(updated) > 0 && s.postSyncHook != nil {
+		s.postSyncHook(updated)
+	}
+
 	// Build message
 	parts := []string{}
 	if len(newApps) > 0 {