feat: Remove load_main_playlist endpoint and implement automatic loading on startup

app/routes/player.py

@@ -219,18 +219,6 @@ def stop_vlc_instance():
         return ErrorHandlingService.handle_generic_error(e)
 
 
-@bp.route("/load-main-playlist", methods=["POST"])
-@require_auth
-def load_main_playlist():
-    """Load the main playlist into the player."""
-    try:
-        success = music_player_service.load_main_playlist()
-        if success:
-            return jsonify({"message": "Main playlist loaded successfully"}), 200
-        return jsonify({"error": "Failed to load main playlist"}), 400
-    except Exception as e:
-        return ErrorHandlingService.handle_generic_error(e)
-
 
 @bp.route("/test-emit", methods=["POST"])
 @require_auth