🧬 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/app/clients/tools/util/handleTools.js

@@ -10,8 +10,8 @@ const {
   createSafeUser,
   mcpToolPattern,
   loadWebSearchAuth,
-  mcpServersRegistry,
 } = require('@librechat/api');
+const { getMCPServersRegistry } = require('~/config');
 const {
   Tools,
   Constants,
@@ -340,7 +340,10 @@ Current Date & Time: ${replaceSpecialVars({ text: '{{iso_datetime}}' })}
         /** Placeholder used for UI purposes */
         continue;
       }
-      if (serverName && (await mcpServersRegistry.getServerConfig(serverName, user)) == undefined) {
+      if (
+        serverName &&
+        (await getMCPServersRegistry().getServerConfig(serverName, user)) == undefined
+      ) {
         logger.warn(
           `MCP server "${serverName}" for "${toolName}" tool is not configured${agent?.id != null && agent.id ? ` but attached to "${agent.id}"` : ''}`,
         );