chore: update n8n to v1.99.1

- Updated n8n from 1.97.1 to 1.99.1
- Updated n8n-core from 1.96.0 to 1.98.0
- Updated n8n-workflow from 1.94.0 to 1.96.0
- Updated @n8n/n8n-nodes-langchain from 1.96.1 to 1.98.1
- Rebuilt node database with 526 nodes
- All validation tests passing

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -60,14 +60,14 @@
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.12.1",
-    "@n8n/n8n-nodes-langchain": "^1.96.1",
+    "@n8n/n8n-nodes-langchain": "^1.98.1",
     "axios": "^1.10.0",
     "better-sqlite3": "^11.10.0",
     "dotenv": "^16.5.0",
     "express": "^5.1.0",
-    "n8n": "^1.97.1",
-    "n8n-core": "^1.96.0",
-    "n8n-workflow": "^1.94.0",
+    "n8n": "^1.99.1",
+    "n8n-core": "^1.98.0",
+    "n8n-workflow": "^1.96.0",
     "sql.js": "^1.13.0"
   }
 }