🗑️ 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

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

api/app/clients/tools/index.js

@@ -5,7 +5,6 @@ const DALLE3 = require('./structured/DALLE3');
 const FluxAPI = require('./structured/FluxAPI');
 const OpenWeather = require('./structured/OpenWeather');
 const StructuredWolfram = require('./structured/Wolfram');
-const createYouTubeTools = require('./structured/YouTube');
 const StructuredACS = require('./structured/AzureAISearch');
 const StructuredSD = require('./structured/StableDiffusion');
 const GoogleSearchAPI = require('./structured/GoogleSearch');
@@ -25,7 +24,6 @@ module.exports = {
   GoogleSearchAPI,
   TraversaalSearch,
   StructuredWolfram,
-  createYouTubeTools,
   TavilySearchResults,
   createOpenAIImageTools,
   createGeminiImageTool,