feat: 数据导出/导入（资产迁移/备份，支撑部署到其他服务器）

app/routers/assets.py

@@ -5,7 +5,7 @@
 
 from typing import List, Optional
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Body, Depends, Query
 from sqlmodel import Session
 
 from app.core.security import require_api_key
@@ -32,6 +32,22 @@ def list_assets(
     )
 
 
+@router.get("/export", summary="导出所有资产（数据迁移/备份）")
+def export_assets(session: Session = Depends(get_session)) -> dict:
+    return asset_service.export_assets(session)
+
+
+@router.post(
+    "/import",
+    summary="导入资产（从导出数据，按 name+类型+服务商去重）",
+    dependencies=[Depends(require_api_key)],
+)
+def import_assets_endpoint(
+    data: dict = Body(...), session: Session = Depends(get_session)
+) -> dict:
+    return asset_service.import_assets(session, data.get("assets", []))
+
+
 @router.get("/{asset_id}", response_model=AssetRead, summary="资产详情")
 def get_asset(asset_id: int, session: Session = Depends(get_session)):
     return asset_service.get_asset(session, asset_id)