Integrate React frontend with backend API

app/utils/local_playlist.py

@@ -1,5 +1,6 @@
 import os
 from typing import List
+from datetime import datetime
 from app.utils.logger import logger
 
 def load_local_playlist(playlist_path: str) -> List[str]:
@@ -42,7 +43,9 @@ def scan_local_playlists(base_path: str) -> list[dict]:
         base_path: Directory that contains playlist files.
 
     Returns:
-        A list of dictionaries with ``name`` and ``track_count`` keys.
+        A list of dictionaries with ``name`` and ``track_count`` keys, and
+        additional metadata (``path`` and ``last_modified``) for richer API
+        responses.
     """
 
     playlists: list[dict] = []
@@ -61,7 +64,15 @@ def scan_local_playlists(base_path: str) -> list[dict]:
         if not entry.name.lower().endswith((".m3u", ".m3u8")):
             continue
         tracks = load_local_playlist(entry.path)
-        playlists.append({"name": entry.name, "track_count": len(tracks)})
+        last_modified = datetime.fromtimestamp(entry.stat().st_mtime)
+        playlists.append(
+            {
+                "name": entry.name,
+                "track_count": len(tracks),
+                "path": entry.path,
+                "last_modified": last_modified.isoformat(),
+            }
+        )
 
     playlists.sort(key=lambda item: item["name"].lower())
     logger.info(f"Found {len(playlists)} playlists under {absolute_path}.")