🗑️ 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>

package-lock.json

@@ -57,7 +57,6 @@
         "@azure/search-documents": "^12.0.0",
         "@azure/storage-blob": "^12.27.0",
         "@google/genai": "^1.19.0",
-        "@googleapis/youtube": "^20.0.0",
         "@keyv/redis": "^4.3.3",
         "@langchain/core": "^0.3.80",
         "@librechat/agents": "^3.0.77",
@@ -126,7 +125,6 @@
         "undici": "^7.10.0",
         "winston": "^3.11.0",
         "winston-daily-rotate-file": "^5.0.0",
-        "youtube-transcript": "^1.2.1",
         "zod": "^3.22.4"
       },
       "devDependencies": {
@@ -10739,18 +10737,6 @@
         "node": ">=18.0.0"
       }
     },
-    "node_modules/@googleapis/youtube": {
-      "version": "20.0.0",
-      "resolved": "https://registry.npmjs.org/@googleapis/youtube/-/youtube-20.0.0.tgz",
-      "integrity": "sha512-wdt1J0JoKYhvpoS2XIRHX0g/9ul/B0fQeeJAhuuBIdYINuuLt6/oZYZZCBmkuhtkA3IllXgqgAXOjLtLRAnR2g==",
-      "license": "Apache-2.0",
-      "dependencies": {
-        "googleapis-common": "^7.0.0"
-      },
-      "engines": {
-        "node": ">=12.0.0"
-      }
-    },
     "node_modules/@grpc/grpc-js": {
       "version": "1.9.15",
       "resolved": "https://registry.npmjs.org/@grpc/grpc-js/-/grpc-js-1.9.15.tgz",
@@ -27690,22 +27676,6 @@
         "node": ">=14"
       }
     },
-    "node_modules/googleapis-common": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/googleapis-common/-/googleapis-common-7.0.1.tgz",
-      "integrity": "sha512-mgt5zsd7zj5t5QXvDanjWguMdHAcJmmDrF9RkInCecNsyV7S7YtGqm5v2IWONNID88osb7zmx5FtrAP12JfD0w==",
-      "dependencies": {
-        "extend": "^3.0.2",
-        "gaxios": "^6.0.3",
-        "google-auth-library": "^9.0.0",
-        "qs": "^6.7.0",
-        "url-template": "^2.0.8",
-        "uuid": "^9.0.0"
-      },
-      "engines": {
-        "node": ">=14.0.0"
-      }
-    },
     "node_modules/gopd": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/gopd/-/gopd-1.2.0.tgz",
@@ -41538,11 +41508,6 @@
         "requires-port": "^1.0.0"
       }
     },
-    "node_modules/url-template": {
-      "version": "2.0.8",
-      "resolved": "https://registry.npmjs.org/url-template/-/url-template-2.0.8.tgz",
-      "integrity": "sha512-XdVKMF4SJ0nP/O7XIPB0JwAEuT9lDIYnNsK8yGVe43y0AWoKeJNdv3ZNWh7ksJ6KqQFjOO6ox/VEitLnaVNufw=="
-    },
     "node_modules/url/node_modules/punycode": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
@@ -43095,15 +43060,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/youtube-transcript": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/youtube-transcript/-/youtube-transcript-1.2.1.tgz",
-      "integrity": "sha512-TvEGkBaajKw+B6y91ziLuBLsa5cawgowou+Bk0ciGpjELDfAzSzTGXaZmeSSkUeknCPpEr/WGApOHDwV7V+Y9Q==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=18.0.0"
-      }
-    },
     "node_modules/zod": {
       "version": "3.25.67",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.67.tgz",