feat: 0.11.7 — Stale data cleanup + FileBrowser sync after migration + deploy title fix

- Detect stale data on non-active storage paths after migration; show on
  deploy/settings page with size info and two-step delete confirmation
- Add POST /api/storage/stale-cleanup handler with safety checks (active
  path protection, registered-path validation, ProtectedHDDPaths guard)
- Export ProtectedHDDPaths() from stacks package for reuse in web handlers
- Sync FileBrowser mounts after successful app data migration
- Deploy page title/h2 now shows "Beállítások" for already-deployed apps
  instead of always showing "Telepítés"
- Also add delete-old-data button on migration-done card in migrate.html

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

controller/internal/web/handlers.go

@@ -164,7 +164,11 @@ func (s *Server) deployHandler(w http.ResponseWriter, r *http.Request, name stri
 	stack, _ := s.stackMgr.GetStack(name)
 	alreadyDeployed := appCfg != nil && appCfg.Deployed
 
-	data := s.baseData("deploy", meta.DisplayName+" — Telepítés")
+	pageTitle := meta.DisplayName + " — Telepítés"
+	if alreadyDeployed {
+		pageTitle = meta.DisplayName + " — Beállítások"
+	}
+	data := s.baseData("deploy", pageTitle)
 	data["Stack"] = stack
 	data["Meta"] = meta
 	data["AppConfig"] = appCfg
@@ -195,6 +199,11 @@ func (s *Server) deployHandler(w http.ResponseWriter, r *http.Request, name stri
 			data["StorageInfo"] = storageInfo
 			data["OtherStoragePaths"] = s.otherStoragePathsForStack(name)
 		}
+		// Stale data from previous migrations (only for deployed apps with HDD data)
+		staleData := s.findStaleStorageData(name)
+		if len(staleData) > 0 {
+			data["StaleData"] = staleData
+		}
 	}
 
 	// Memory info for deploy page (only for non-deployed apps)