v0.10.0: Phase B — Storage Management UI Polish & Health Severity Fix

- Health severity fix: mount-point check downgraded from issue (FAIL) to warning (WARN)
- All storage health messages translated to Hungarian
- Success flash messages for all storage operations
- Edit storage path labels (inline edit UI + backend)
- App details per storage path on settings page (expandable list with names + sizes)
- Storage badge on stacks page showing which storage each app uses
- Deploy dropdown with free space display and low-space warning (<20%)
- Filesystem & disk info on settings page (ext4/btrfs, device, model via findmnt)
- Backup page storage context with per-app storage label badges

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

controller/internal/web/server.go

@@ -102,6 +102,8 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		s.settingsStorageDefaultHandler(w, r)
 	case path == "/settings/storage/schedulable" && r.Method == http.MethodPost:
 		s.settingsStorageSchedulableHandler(w, r)
+	case path == "/settings/storage/label" && r.Method == http.MethodPost:
+		s.settingsStorageLabelHandler(w, r)
 	case path == "/settings/app-backup" && r.Method == http.MethodPost:
 		s.settingsAppBackupHandler(w, r)
 	case path == "/backup/restore" && r.Method == http.MethodPost: