thực hiện phân quyền admin giáo viên và học sinh xong

backend/app/main.py

@@ -3,7 +3,7 @@ from contextlib import asynccontextmanager
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-from .routers import annotations, auth, pdfs, ws
+from .routers import admin, annotations, auth, pdfs, ws
 
 
 @asynccontextmanager
@@ -24,6 +24,7 @@ app.add_middleware(
 )
 
 app.include_router(auth.router, prefix="/api")
+app.include_router(admin.router, prefix="/api")
 app.include_router(pdfs.router, prefix="/api")
 app.include_router(annotations.router, prefix="/api")
 app.include_router(ws.router)  # WebSocket — no /api prefix (ws:// path)