서버 진단용 테스트 API 추가

app/routers/settings.py

@@ -377,6 +377,10 @@ async def log_ui_event(data: UiEventRequest, current_user = Depends(get_current_
     log_event(current_user, data.action, "info", data.details or {})
     return {"message": "logged"}
 
+@router.get("/test-ping")
+async def test_ping():
+    return {"status": "ok", "message": "pong"}
+
 @router.get("/database-size")
 async def get_database_size(db: Session = Depends(get_db), current_user = Depends(get_current_user)):
     try: