feat: Implement playlist synchronization result writeback functionality.

app/utils/local_playlist.py

@@ -65,4 +65,48 @@ def scan_local_playlists(base_path: str) -> list[dict]:
 
     playlists.sort(key=lambda item: item["name"].lower())
     logger.info(f"Found {len(playlists)} playlists under {absolute_path}.")
-    return playlists
+    return playlists
+def write_local_playlist(playlist_path: str, tracks: List[str]) -> bool:
+    """
+    Write a list of tracks to a local playlist file.
+
+    Args:
+        playlist_path (str): The path to the playlist file.
+        tracks (list): A list of songs to write to the playlist.
+
+    Returns:
+        bool: True if successful, False otherwise.
+    """
+    try:
+        with open(playlist_path, 'w', encoding="utf-8") as file:
+            file.write("#EXTM3U\n")
+            for track in tracks:
+                file.write(f"{track}\n")
+        logger.info(f"Written {len(tracks)} songs to the playlist: {playlist_path}")
+        return True
+    except Exception as e:
+        logger.error(f"An error occurred while writing the playlist {playlist_path}: {e}")
+        return False
+
+
+def delete_local_playlist(playlist_path: str) -> bool:
+    """
+    Delete a local playlist file.
+
+    Args:
+        playlist_path (str): The path to the playlist file.
+
+    Returns:
+        bool: True if successful, False otherwise.
+    """
+    try:
+        if os.path.exists(playlist_path):
+            os.remove(playlist_path)
+            logger.info(f"Deleted playlist: {playlist_path}")
+            return True
+        else:
+            logger.warning(f"Playlist not found for deletion: {playlist_path}")
+            return False
+    except Exception as e:
+        logger.error(f"An error occurred while deleting the playlist {playlist_path}: {e}")
+        return False