refactor: Improve exception handling and logging in authentication and playlist services; enhance code readability and structure

app/api/v1/playlists.py

@@ -32,7 +32,7 @@ async def get_playlist_service(
 
 
 @router.get("/")
-async def get_all_playlists(
+async def get_all_playlists(  # noqa: PLR0913
     current_user: Annotated[User, Depends(get_current_active_user_flexible)],  # noqa: ARG001
     playlist_service: Annotated[PlaylistService, Depends(get_playlist_service)],
     search: Annotated[
@@ -57,7 +57,7 @@ async def get_all_playlists(
     ] = 0,
 ) -> list[dict]:
     """Get all playlists from all users with search and sorting."""
-    playlists = await playlist_service.search_and_sort_playlists(
+    return await playlist_service.search_and_sort_playlists(
         search_query=search,
         sort_by=sort_by,
         sort_order=sort_order,
@@ -66,7 +66,6 @@ async def get_all_playlists(
         limit=limit,
         offset=offset,
     )
-    return playlists
 
 
 @router.get("/user")