feat: add admin routes, summarizer service, and CLI summarize command

- Add /admin routes for manual trigger and status inspection
- Add summarizer service with batch/single summary support
- Add summarize CLI command (single arxiv_id or batch pending)
- Register admin router in main app
- Add tests for summarizer

app/main.py

@@ -9,6 +9,7 @@ from fastapi.staticfiles import StaticFiles
 from app.config import settings
 from app.database import engine
 from app.models import init_db
+from app.routes.admin import router as admin_router
 from app.routes.pages import router as pages_router
 
 logging.basicConfig(
@@ -41,6 +42,7 @@ def create_app() -> FastAPI:
 
     # 路由
     app.include_router(pages_router)
+    app.include_router(admin_router)
 
     return app