fix: use deleteSnapshotFromLocalDB in syncWithRemote

syncWithRemote was calling v.Repositories.Snapshots.Delete() directly,
which only removes the snapshots row. This leaves orphaned rows in
snapshot_files, snapshot_blobs, and uploads tables.

Replace with deleteSnapshotFromLocalDB() which properly cleans up all
related tables before deleting the snapshot record.

closes #10

internal/vaultik/prune.go

@@ -35,7 +35,6 @@ func (v *Vaultik) PruneBlobs(opts *PruneOptions) error {
 	log.Info("Listing remote snapshots")
 	objectCh := v.Storage.ListStream(v.ctx, "metadata/")
 
-	seen := make(map[string]bool)
 	var snapshotIDs []string
 	for object := range objectCh {
 		if object.Err != nil {
@@ -48,8 +47,15 @@ func (v *Vaultik) PruneBlobs(opts *PruneOptions) error {
 			// Check if this is a directory by looking for trailing slash
 			if strings.HasSuffix(object.Key, "/") || strings.Contains(object.Key, "/manifest.json.zst") {
 				snapshotID := parts[1]
-				if !seen[snapshotID] {
-					seen[snapshotID] = true
+				// Only add unique snapshot IDs
+				found := false
+				for _, id := range snapshotIDs {
+					if id == snapshotID {
+						found = true
+						break
+					}
+				}
+				if !found {
 					snapshotIDs = append(snapshotIDs, snapshotID)
 				}
 			}

internal/vaultik/snapshot.go

@@ -802,7 +802,7 @@ func (v *Vaultik) syncWithRemote() error {
 		snapshotIDStr := snapshot.ID.String()
 		if !remoteSnapshots[snapshotIDStr] {
 			log.Info("Removing local snapshot not found in remote", "snapshot_id", snapshot.ID)
-			if err := v.Repositories.Snapshots.Delete(v.ctx, snapshotIDStr); err != nil {
+			if err := v.deleteSnapshotFromLocalDB(snapshotIDStr); err != nil {
 				log.Error("Failed to delete local snapshot", "snapshot_id", snapshot.ID, "error", err)
 			} else {
 				removedCount++
@@ -913,7 +913,6 @@ func (v *Vaultik) RemoveAllSnapshots(opts *RemoveOptions) (*RemoveResult, error)
 	log.Info("Listing all snapshots")
 	objectCh := v.Storage.ListStream(v.ctx, "metadata/")
 
-	seen := make(map[string]bool)
 	var snapshotIDs []string
 	for object := range objectCh {
 		if object.Err != nil {
@@ -928,8 +927,14 @@ func (v *Vaultik) RemoveAllSnapshots(opts *RemoveOptions) (*RemoveResult, error)
 			}
 			if strings.HasSuffix(object.Key, "/") || strings.Contains(object.Key, "/manifest.json.zst") {
 				sid := parts[1]
-				if !seen[sid] {
-					seen[sid] = true
+				found := false
+				for _, id := range snapshotIDs {
+					if id == sid {
+						found = true
+						break
+					}
+				}
+				if !found {
 					snapshotIDs = append(snapshotIDs, sid)
 				}
 			}