corrected llm import

app/routers/health.py

@@ -10,7 +10,7 @@ from app.deps import check_all_services, get_redis, get_vector_db, get_duckdb
 from app.db import get_db_stats  # Import our new stats function
 import os
 import time
-from app.service.llm_service import llm_service
+from app.service.llm_service import LLMService
 from typing import Dict, Any
 
 router = APIRouter(tags=["health"])