Fix build and lint issues

- Corrected imports in external-verifier.ts (OAuthTokenVerifier from provider.js)
- Fixed InvalidTokenError import from errors.js
- Changed logger.warn to logger.info (warn method doesn't exist)
- Removed unused OAuthTokens import from services/auth.ts

src/auth/external-verifier.ts

@@ -1,5 +1,6 @@
-import { OAuthTokenVerifier } from '@modelcontextprotocol/sdk/server/auth/types.js';
-import { AuthInfo, InvalidTokenError } from '@modelcontextprotocol/sdk/server/auth/types.js';
+import { OAuthTokenVerifier } from '@modelcontextprotocol/sdk/server/auth/provider.js';
+import { AuthInfo } from '@modelcontextprotocol/sdk/server/auth/types.js';
+import { InvalidTokenError } from '@modelcontextprotocol/sdk/server/auth/errors.js';
 import { TokenIntrospectionResponse } from '../../shared/types.js';
 import { logger } from '../utils/logger.js';
 
@@ -53,10 +54,8 @@ export class ExternalAuthVerifier implements OAuthTokenVerifier {
       // Extract user ID from standard 'sub' claim or custom 'userId' field
       const userId = data.sub || data.userId;
       if (!userId) {
-        logger.warn('Token introspection response missing user ID', {
-          hasS
-
-: !!data.sub,
+        logger.info('Token introspection response missing user ID', {
+          hasSub: !!data.sub,
           hasUserId: !!data.userId,
         });
       }

src/services/auth.ts

@@ -1,6 +1,6 @@
 import { redisClient } from "../redis.js";
 import { McpInstallation, PendingAuthorization, TokenExchange } from "../types.js";
-import { OAuthClientInformationFull, OAuthTokens } from "@modelcontextprotocol/sdk/shared/auth.js";
+import { OAuthClientInformationFull } from "@modelcontextprotocol/sdk/shared/auth.js";
 
 // Re-export from shared modules for backward compatibility
 export {