Add Claude N8N toolkit with Docker mock API server

- Added comprehensive N8N development tools collection
- Added Docker-containerized mock API server for testing
- Added complete documentation and setup guides
- Added mock API server with health checks and data endpoints
- Tools include workflow analyzers, debuggers, and controllers

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

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

claude_n8n/tools/mock_api_server/docker-compose.yml

@@ -0,0 +1,21 @@
+version: '3.8'
+
+services:
+  mock-api:
+    build: .
+    ports:
+      - "5002:5000"
+    volumes:
+      - ./api_data:/app/api_data
+    environment:
+      - PYTHONUNBUFFERED=1
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:5000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+volumes:
+  api_data: