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/backup/crossdrive.go

@@ -52,8 +52,8 @@ func (r *CrossDriveRunner) SetDBDumper(d DBDumper) {
 	r.dbDumper = d
 }
 
-// getAppDrivePath returns the drive path for an app.
-func (r *CrossDriveRunner) getAppDrivePath(stackName string) string {
+// GetAppDrivePath returns the drive path for an app (HDD path or system data path fallback).
+func (r *CrossDriveRunner) GetAppDrivePath(stackName string) string {
 	if hddPath := r.stackProvider.GetStackHDDPath(stackName); hddPath != "" {
 		return hddPath
 	}
@@ -334,7 +334,7 @@ func (r *CrossDriveRunner) runRsyncBackup(ctx context.Context, stackName, destBa
 // copyStackDBDumps copies DB dump files for the given stack from its home drive.
 // DB dumps are at <drive>/backups/primary/<stack>/db-dumps/<stack>_<dbtype>.sql.
 func (r *CrossDriveRunner) copyStackDBDumps(stackName, destDir string) error {
-	appDrive := r.getAppDrivePath(stackName)
+	appDrive := r.GetAppDrivePath(stackName)
 	dumpDir := AppDBDumpPath(appDrive, stackName)
 
 	entries, err := os.ReadDir(dumpDir)
@@ -441,7 +441,7 @@ func (r *CrossDriveRunner) AutoEnableSmallApps() {
 		}
 
 		// Find destination: first active storage path that differs from the app's home drive
-		appDrive := r.getAppDrivePath(stack.Name)
+		appDrive := r.GetAppDrivePath(stack.Name)
 		var destPath string
 		for _, sp := range storagePaths {
 			if sp.Path != appDrive && !sp.Disconnected && !sp.Decommissioned {