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/backup/paths.go

@@ -20,6 +20,11 @@ func AppDBDumpPath(drivePath, stackName string) string {
 	return filepath.Join(drivePath, FelhomDataDir, "backups", "primary", stackName, "db-dumps")
 }
 
+// AppVolumeDumpPath returns the directory for Docker volume dump tars on an app's home drive.
+func AppVolumeDumpPath(drivePath, stackName string) string {
+	return filepath.Join(drivePath, FelhomDataDir, "backups", "primary", stackName, "volume-dumps")
+}
+
 // SecondaryBackupPath returns the root secondary backup directory for a drive.
 func SecondaryBackupPath(drivePath string) string {
 	return filepath.Join(drivePath, FelhomDataDir, "backups", "secondary")