Fix list_media to use get_user_items instead of list_cache_items

list_cache_items doesn't accept actor_id parameter.
Use get_user_items which properly filters by actor_id and item_type.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/services/cache_service.py

@@ -489,12 +489,12 @@ class CacheService:
         media_type: str = None,
     ) -> List[Dict[str, Any]]:
         """List media items in cache."""
-        # Get items from database
-        items = await self.db.list_cache_items(
+        # Get items from database (uses item_types table)
+        items = await self.db.get_user_items(
             actor_id=actor_id or username,
-            media_type=media_type,
-            offset=offset,
+            item_type=media_type,  # "video", "image", "audio", or None for all
             limit=limit,
+            offset=offset,
         )
         return items