🌐 feat: OpenRouter Web Search (#9853)

* 🌐 feat: OpenRouter Web Search

- Added tests for handling web_search parameter with OpenRouter in various scenarios.
- Implemented logic to manage web_search in modelOptions and addParams/dropParams.
- Ensured correct configuration of llmConfig and modelKwargs for OpenRouter, including handling of plugins.
- Improved overall integration of OpenRouter with OpenAI API, ensuring expected behavior across different configurations.

* chore: bump @librechat/agents to v2.4.81

package-lock.json

@@ -65,7 +65,7 @@
         "@langchain/google-vertexai": "^0.2.13",
         "@langchain/openai": "^0.5.18",
         "@langchain/textsplitters": "^0.1.0",
-        "@librechat/agents": "^2.4.80",
+        "@librechat/agents": "^2.4.81",
         "@librechat/api": "*",
         "@librechat/data-schemas": "*",
         "@microsoft/microsoft-graph-client": "^3.0.7",
@@ -21910,9 +21910,9 @@
       }
     },
     "node_modules/@librechat/agents": {
-      "version": "2.4.80",
-      "resolved": "https://registry.npmjs.org/@librechat/agents/-/agents-2.4.80.tgz",
-      "integrity": "sha512-+GlWHMrgiwkptnUip7jJrz9oAQSz4+uJNoa+X6zR9W6x90NnknFwoQsXhQlnXoDGW75uGb+U7KI9mQz5H/YL6Q==",
+      "version": "2.4.81",
+      "resolved": "https://registry.npmjs.org/@librechat/agents/-/agents-2.4.81.tgz",
+      "integrity": "sha512-uPepwOepQS03NJg9jzLvYGonyewy33QDB7iENKHooO8+6eIOv2QC4gm1k/fYKgsIfBfng2caRmn532UTrkE3rQ==",
       "license": "MIT",
       "dependencies": {
         "@langchain/anthropic": "^0.3.26",
@@ -51641,7 +51641,7 @@
       },
       "peerDependencies": {
         "@langchain/core": "^0.3.62",
-        "@librechat/agents": "^2.4.80",
+        "@librechat/agents": "^2.4.81",
         "@librechat/data-schemas": "*",
         "@modelcontextprotocol/sdk": "^1.17.1",
         "axios": "^1.12.1",