chore: update n8n to 1.118.1 and bump version to 2.22.8 (#393)

- Updated n8n from 1.117.2 to 1.118.1
- Updated n8n-core from 1.116.0 to 1.117.0
- Updated n8n-workflow from 1.114.0 to 1.115.0
- Updated @n8n/n8n-nodes-langchain from 1.116.2 to 1.117.0
- Rebuilt node database with 542 nodes (439 from n8n-nodes-base, 103 from @n8n/n8n-nodes-langchain)
- Updated README badge with new n8n version
- Updated CHANGELOG with dependency changes

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

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

Co-authored-by: Claude <noreply@anthropic.com>

package.json

@@ -140,15 +140,15 @@
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.20.1",
-    "@n8n/n8n-nodes-langchain": "^1.116.2",
+    "@n8n/n8n-nodes-langchain": "^1.117.0",
     "@supabase/supabase-js": "^2.57.4",
     "dotenv": "^16.5.0",
     "express": "^5.1.0",
     "express-rate-limit": "^7.1.5",
     "lru-cache": "^11.2.1",
-    "n8n": "^1.117.2",
-    "n8n-core": "^1.116.0",
-    "n8n-workflow": "^1.114.0",
+    "n8n": "^1.118.1",
+    "n8n-core": "^1.117.0",
+    "n8n-workflow": "^1.115.0",
     "openai": "^4.77.0",
     "sql.js": "^1.13.0",
     "tslib": "^2.6.2",