chore: update n8n to 1.122.4 and remove ludwig's templates (v2.28.3) (#463)

- Updated n8n from 1.121.2 to 1.122.4
- Updated n8n-core from 1.120.1 to 1.121.1
- Updated n8n-workflow from 1.118.1 to 1.119.1
- Updated @n8n/n8n-nodes-langchain from 1.120.1 to 1.121.1
- Rebuilt node database with 544 nodes (438 from n8n-nodes-base, 106 from @n8n/n8n-nodes-langchain)
- Removed 7 templates from creator "ludwig" at author's request (IDs: 2795, 2816, 2825, 2850, 2869, 2939, 3847)
- 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

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.28.2",
+  "version": "2.28.3",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -141,16 +141,16 @@
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "1.20.1",
-    "@n8n/n8n-nodes-langchain": "^1.120.1",
+    "@n8n/n8n-nodes-langchain": "^1.121.1",
     "@supabase/supabase-js": "^2.57.4",
     "dotenv": "^16.5.0",
     "express": "^5.1.0",
     "express-rate-limit": "^7.1.5",
     "form-data": "^4.0.5",
     "lru-cache": "^11.2.1",
-    "n8n": "^1.121.2",
-    "n8n-core": "^1.120.1",
-    "n8n-workflow": "^1.118.1",
+    "n8n": "^1.122.4",
+    "n8n-core": "^1.121.1",
+    "n8n-workflow": "^1.119.1",
     "openai": "^4.77.0",
     "sql.js": "^1.13.0",
     "tslib": "^2.6.2",