🛡️ feat: Add Middleware for JSON Parsing and Prompt Group Updates (#10757)

* 🗨️ fix: Safe Validation for Prompt Updates

- Added `safeValidatePromptGroupUpdate` function to validate and sanitize prompt group update requests, ensuring only allowed fields are processed and sensitive fields are stripped.
- Updated the `patchPromptGroup` route to utilize the new validation function, returning appropriate error messages for invalid requests.
- Introduced comprehensive tests for the validation logic, covering various scenarios including allowed and disallowed fields, enhancing overall request integrity and security.
- Created a new schema file for prompt group updates, defining validation rules and types for better maintainability.

* 🔒 feat: Add JSON parse error handling middleware

api/server/experimental.js

@@ -16,6 +16,7 @@ const {
   isEnabled,
   ErrorController,
   performStartupChecks,
+  handleJsonParseError,
   initializeFileStorage,
 } = require('@librechat/api');
 const { connectDb, indexSync } = require('~/db');
@@ -245,6 +246,7 @@ if (cluster.isMaster) {
     app.use(noIndex);
     app.use(express.json({ limit: '3mb' }));
     app.use(express.urlencoded({ extended: true, limit: '3mb' }));
+    app.use(handleJsonParseError);
     app.use(mongoSanitize());
     app.use(cors());
     app.use(cookieParser());