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/settings/settings.go

@@ -337,6 +337,19 @@ func (s *Settings) SetSchedulable(path string, schedulable bool) error {
 	return fmt.Errorf("storage path %q not found", path)
 }
 
+// SetStorageLabel updates the label for a storage path.
+func (s *Settings) SetStorageLabel(path, label string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for i := range s.StoragePaths {
+		if s.StoragePaths[i].Path == path {
+			s.StoragePaths[i].Label = label
+			return s.save()
+		}
+	}
+	return fmt.Errorf("storage path %q not found", path)
+}
+
 // AutoDiscoverStoragePaths scans for HDD_PATH values and registers them if none exist.
 // discoveredPaths are pre-scanned HDD_PATH values from deployed apps' app.yaml.
 // fallbackHDDPath is the legacy controller.yaml paths.hdd_path (may be empty).