🧬 refactor: Wire Database Methods into MCP Package via Registry Pattern (#10715)

* Refactor: MCPServersRegistry Singleton Pattern with Dependency Injection for DB methods consumption

* refactor: error handling in MCP initialization and improve logging for MCPServersRegistry instance creation.

- Added checks for mongoose instance in ServerConfigsDB constructor and refined error messages for clarity.
- Reorder and use type imports

---------

Co-authored-by: Atef Bellaaj <slalom.bellaaj@external.daimlertruck.com>
Co-authored-by: Danny Avila <danny@librechat.ai>

api/config/index.js

@@ -1,6 +1,11 @@
 const { EventSource } = require('eventsource');
 const { Time } = require('librechat-data-provider');
-const { MCPManager, FlowStateManager, OAuthReconnectionManager } = require('@librechat/api');
+const {
+  MCPManager,
+  FlowStateManager,
+  MCPServersRegistry,
+  OAuthReconnectionManager,
+} = require('@librechat/api');
 const logger = require('./winston');
 
 global.EventSource = EventSource;
@@ -23,6 +28,8 @@ function getFlowStateManager(flowsCache) {
 
 module.exports = {
   logger,
+  createMCPServersRegistry: MCPServersRegistry.createInstance,
+  getMCPServersRegistry: MCPServersRegistry.getInstance,
   createMCPManager: MCPManager.createInstance,
   getMCPManager: MCPManager.getInstance,
   getFlowStateManager,