feat: Docker volume backup, Tier 2 restore, restore dropdown fixes (v0.33.0)

- Add Docker named volume backup to Tier 1 (dump to tar, include in restic)
  and Tier 2 (copy tars to rsync mirror _volumes/ dir)
- Fix volume name resolution: use project-prefixed names (mealie_mealie_data)
- Fix double Tier 1 in restore dropdown: filter snapshots by app's home drive
- Add Tier 2 restore: RestoreAppFromTier2() restores from rsync mirror
- Show Tier 2 entry in restore dropdown when cross-drive backup succeeded
- Add .fab import link in restore section
- Volume-aware restore type banners and backup content labels

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

controller/internal/api/router.go

@@ -795,7 +795,18 @@ func (r *Router) backupSnapshots(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	snapshots, err := r.backupMgr.ListAllSnapshots(50)
+	stackName := req.URL.Query().Get("stack")
+
+	var snapshots []backup.SnapshotInfo
+	var err error
+
+	if stackName != "" {
+		// Per-app: only snapshots from the app's home drive
+		snapshots, err = r.backupMgr.ListSnapshotsForApp(stackName, 20)
+	} else {
+		// Fallback: all snapshots (general use)
+		snapshots, err = r.backupMgr.ListAllSnapshots(50)
+	}
 	if err != nil {
 		r.logger.Printf("[ERROR] [api] Failed to list backup snapshots: %v", err)
 		writeJSON(w, http.StatusInternalServerError, apiResponse{OK: false, Error: err.Error()})
@@ -814,6 +825,32 @@ func (r *Router) backupSnapshots(w http.ResponseWriter, req *http.Request) {
 				}
 			}
 		}
+
+		// Append Tier 2 (cross-drive rsync) entry if available for this app
+		if stackName != "" {
+			cdCfg := r.sett.GetCrossDriveConfig(stackName)
+			if cdCfg != nil && cdCfg.Enabled && cdCfg.LastStatus == "ok" && cdCfg.LastRun != "" {
+				lastRun, _ := time.Parse(time.RFC3339, cdCfg.LastRun)
+				if !lastRun.IsZero() {
+					// Resolve drive label for destination
+					var destLabel string
+					for _, sp := range storagePaths {
+						if sp.Path == cdCfg.DestinationPath {
+							destLabel = sp.Label
+							break
+						}
+					}
+					tier2 := backup.SnapshotInfo{
+						ID:         "tier2-rsync",
+						Time:       lastRun,
+						Tier:       2,
+						Source:     "rsync",
+						DriveLabel: destLabel,
+					}
+					snapshots = append(snapshots, tier2)
+				}
+			}
+		}
 	}
 
 	if snapshots == nil {