🪪 feat: Microsoft Graph Access Token Placeholder for MCP Servers (#10867)

* feat: MCP Graph Token env var

* Addressing copilot remarks

* Addressed Copilot review remarks

* Fixed graphtokenservice mock in MCP test suite

* fix: remove unnecessary type check and cast in resolveGraphTokensInRecord

* ci: add Graph Token integration tests in MCPManager

* refactor: update user type definitions to use Partial<IUser> in multiple functions

* test: enhance MCP tests for graph token processing and user placeholder resolution

- Added comprehensive tests to validate the interaction between preProcessGraphTokens and processMCPEnv.
- Ensured correct resolution of graph tokens and user placeholders in various configurations.
- Mocked OIDC utilities to facilitate testing of token extraction and validation.
- Verified that original options remain unchanged after processing.

* chore: import order

* chore: imports

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

api/server/services/MCP.js

@@ -29,6 +29,7 @@ const {
   getMCPManager,
 } = require('~/config');
 const { findToken, createToken, updateToken } = require('~/models');
+const { getGraphApiToken } = require('./GraphTokenService');
 const { reinitMCPServer } = require('./Tools/mcp');
 const { getAppConfig } = require('./Config');
 const { getLogStores } = require('~/cache');
@@ -501,6 +502,7 @@ function createToolInstance({
         },
         oauthStart,
         oauthEnd,
+        graphTokenResolver: getGraphApiToken,
       });
 
       if (isAssistantsEndpoint(provider) && Array.isArray(result)) {