refactor(api-server): remove unused lifespan

Author: NicholasGoh

backend/api/main.py

@@ -1,17 +1,7 @@
-from contextlib import asynccontextmanager
-
 from fastapi import FastAPI
 
 from api.routers import llms, mcps
 
-
-@asynccontextmanager
-async def lifespan(app: FastAPI):
-    yield
-
-
-app = FastAPI(
-    lifespan=lifespan, swagger_ui_parameters={"tryItOutEnabled": True}
-)
+app = FastAPI(swagger_ui_parameters={"tryItOutEnabled": True})
 app.include_router(llms.router, prefix="/v1")
 app.include_router(mcps.router, prefix="/v1")