feat: 社保AI建议、合同附件多文件上传预览、删除合同、扩展上传格式

backend/package.json

@@ -14,6 +14,7 @@
   "dependencies": {
     "@prisma/client": "^5.18.0",
     "@types/multer": "^2.2.0",
+    "@types/redis": "^4.0.10",
     "bcryptjs": "^2.4.3",
     "compression": "^1.7.4",
     "cors": "^2.8.5",
@@ -26,6 +27,7 @@
     "multer": "^2.2.0",
     "node-cron": "^3.0.3",
     "openai": "^6.48.0",
+    "redis": "^6.1.0",
     "uuid": "^10.0.0",
     "xlsx": "^0.18.5",
     "zod": "^3.23.0"