feat：LLM 分析文件并生成结构化建议

app/main.py

@@ -8,6 +8,7 @@ from loguru import logger
 
 from app.api.agent import router
 from app.api.conversations import router as conversation_router
+from app.api.files import UploadSizeLimit
 from app.api.files import limits_router as file_limits_router
 from app.api.files import router as file_router
 from app.api.materials import router as material_router
@@ -98,6 +99,8 @@ def create_app() -> FastAPI:
     # 上传限制无需登录；要先于 /files/{file_id} 注册，否则会被当成文件 ID
     application.include_router(file_limits_router, prefix="/api")
     application.include_router(file_router, prefix="/api", dependencies=authenticated)
+    # 上传在读请求体之前先按 Content-Length 检查大小
+    application.add_middleware(UploadSizeLimit, path=f"/api{file_router.prefix}")
     application.include_router(material_router, prefix="/api")
     return application