improve code

app.py

@@ -1,5 +1,5 @@
 from fastapi.applications import FastAPI
-from api.router import health, topic, user, bot, trial, role, reader
+from api.router import health, topic, user, bot, trial, role
 from fastapi.middleware.cors import CORSMiddleware
 from api.events import register_events
 from utils.utils import pipe