Fix startup and Gemini provider handling

main.py

@@ -12,6 +12,10 @@ from routers import documents, review, search, upload, auth
 from services.auth_service import get_session, cleanup_expired_sessions
 
 
+Path(UPLOAD_DIR).mkdir(parents=True, exist_ok=True)
+Path("data").mkdir(exist_ok=True)
+
+
 class CachedStaticFiles(StaticFiles):
     """StaticFiles that sets a long Cache-Control header so browsers
     don't re-download the same image on every refresh."""
@@ -29,8 +33,6 @@ class CachedStaticFiles(StaticFiles):
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    Path(UPLOAD_DIR).mkdir(parents=True, exist_ok=True)
-    Path("data").mkdir(exist_ok=True)
     create_tables()
     try:
         cleanup_expired_sessions()