fix: add global exception handler for BusinessException

BusinessException (and its subclass LeauditException) had no
FastAPI exception handler, so they escaped as unhandled 500s
even when carrying the correct status code (e.g. 403). Add a
handler that renders the status code and message as a proper
JSON response.

fastapi_admin/app.py

@@ -7,13 +7,14 @@ import sys
 from contextlib import asynccontextmanager
 from pathlib import Path
 
-from fastapi import FastAPI, HTTPException
+from fastapi import FastAPI, HTTPException, Request
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import Response
+from fastapi.responses import JSONResponse, Response
 
 from fastapi_admin.config import APP_NAME, APP_CORS_ORIGINS
 from fastapi_admin.config._loader import _find_project_root
 from fastapi_common.fastapi_common_storage.oss_client import OssClient
+from fastapi_common.fastapi_common_web.exception.Base.BusinessException import BusinessException
 
 # 确保项目根在 sys.path
 _PROJECT_ROOT = _find_project_root()
@@ -61,6 +62,18 @@ def create_app() -> FastAPI:
         allow_headers=["*"],
     )
 
+    # 统一业务异常处理
+    @app.exception_handler(BusinessException)
+    async def handle_business_exception(request: Request, exc: BusinessException):
+        return JSONResponse(
+            status_code=exc.status.value,
+            content={
+                "code": exc.status.value,
+                "message": exc.message,
+                "data": None,
+            },
+        )
+
     # 注册控制器
     from fastapi_admin.bootstrap_parts.controllers import register_controllers
     register_controllers(app)