🗑️ chore: Remove YouTube API integration (#11331)

* 🗑️ refactor: Remove YouTube API integration and related configurations as it's broken and should be integrated via MCP instead. Currently there seems not to be a single MCP out there with working get_transcript methods for months. API seems to have changed and there are no maintainers on these projects. We will work out something soon an MCP solution

- Deleted YouTube API key and related configurations from .env.example.
- Removed YouTube tools and their references from the API client, including the manifest and structured files.
- Updated package.json to remove YouTube-related dependencies.
- Cleaned up toolkit exports by removing YouTube toolkit references.

* chore: revert package removal to properly remove packages

* 🗑️ refactor: Remove YouTube API and related dependencies due to integration issues

---------

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

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

@@ -34,7 +34,6 @@ const {
   StructuredACS,
   TraversaalSearch,
   StructuredWolfram,
-  createYouTubeTools,
   TavilySearchResults,
   createGeminiImageTool,
   createOpenAIImageTools,
@@ -185,11 +184,6 @@ const loadTools = async ({
   };
 
   const customConstructors = {
-    youtube: async (_toolContextMap) => {
-      const authFields = getAuthFields('youtube');
-      const authValues = await loadAuthValues({ userId: user, authFields });
-      return createYouTubeTools(authValues);
-    },
     image_gen_oai: async (toolContextMap) => {
       const authFields = getAuthFields('image_gen_oai');
       const authValues = await loadAuthValues({ userId: user, authFields });