chore: update n8n to v1.103.2

- Updated n8n from 1.102.4 to 1.103.2
- Updated n8n-core from 1.101.2 to 1.102.1
- Updated n8n-workflow from 1.99.1 to 1.100.0
- Updated @n8n/n8n-nodes-langchain from 1.101.2 to 1.102.1
- Rebuilt node database with 532 nodes
- Bumped version to 2.7.21
- All validation tests passing

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

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

package.runtime.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp-runtime",
-  "version": "2.7.19",
+  "version": "2.7.21",
   "description": "n8n MCP Server Runtime Dependencies Only",
   "private": true,
   "dependencies": {