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/README.md

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+# Mock API Server for N8N Testing
+
+A Docker-containerized REST API server that serves test data from JSON files for N8N workflow development and testing.
+
+## Overview
+
+This mock API server provides a consistent, controllable data source for testing N8N workflows without relying on external APIs. It serves data from JSON files and includes features like pagination, random data selection, and file upload capabilities.
+
+## Files Structure
+
+```
+mock_api_server/
+├── README.md              # This documentation
+├── Dockerfile             # Docker image definition
+├── docker-compose.yml     # Docker Compose configuration
+├── mock_api_server.py     # Main Python Flask server (symlinked from ../mock_api_server.py)
+└── api_data/              # JSON data files directory
+    ├── matrix_messages.json   # Matrix chat messages sample data
+    └── test_data.json         # Simple test data
+```
+
+## Quick Start
+
+### Using Docker Compose (Recommended)
+
+```bash
+cd /home/klas/claude_n8n/tools/mock_api_server
+docker compose up -d
+```
+
+The server will be available at: `http://localhost:5002`
+
+### Using Docker Build
+
+```bash
+cd /home/klas/claude_n8n/tools/mock_api_server
+docker build -t mock-api-server .
+docker run -d -p 5002:5000 -v $(pwd)/api_data:/app/api_data mock-api-server
+```
+
+### Using Python Directly
+
+```bash
+cd /home/klas/claude_n8n/tools
+python mock_api_server.py --host 0.0.0.0 --port 5002 --data-dir mock_api_server/api_data
+```
+
+## API Endpoints
+
+### Health Check
+- **GET** `/health` - Server status and available endpoints
+
+### Data Access
+- **GET** `/data` - List all available data files
+- **GET** `/data/<filename>` - Get data from specific file (`.json` extension optional)
+- **GET** `/random/<filename>` - Get random item from array data
+- **GET** `/paginated/<filename>?page=1&per_page=10` - Get paginated data
+
+### Special Endpoints
+- **GET** `/matrix` - Alias for `/data/matrix_messages.json`
+- **POST** `/upload?filename=<name>` - Upload new JSON data file
+
+### Query Parameters
+- `page` - Page number for pagination (default: 1)
+- `per_page` - Items per page (default: 10)
+- `filename` - Target filename for upload (without .json extension)
+
+## Example Usage
+
+### Health Check
+```bash
+curl http://localhost:5002/health
+```
+
+### Get Test Data
+```bash
+curl http://localhost:5002/data/test_data.json
+# Returns: {"message": "Hello from mock API", "timestamp": 1234567890, "items": [...]}
+```
+
+### Get Random Item
+```bash
+curl http://localhost:5002/random/test_data
+# Returns random item from the test_data.json array
+```
+
+### Paginated Data
+```bash
+curl "http://localhost:5002/paginated/matrix_messages?page=1&per_page=5"
+```
+
+### Upload New Data
+```bash
+curl -X POST "http://localhost:5002/upload?filename=my_data" \
+  -H "Content-Type: application/json" \
+  -d '{"test": "value", "items": [1,2,3]}'
+```
+
+## Data Files
+
+### Adding New Data Files
+
+1. **Via File System:** Add `.json` files to the `api_data/` directory
+2. **Via API:** Use the `/upload` endpoint to create new files
+3. **Via Container:** Mount additional volumes or copy files into running container
+
+### Data File Format
+
+Files should contain valid JSON. The server supports:
+- **Objects:** `{"key": "value", "items": [...]}`
+- **Arrays:** `[{"id": 1}, {"id": 2}]`
+
+### Sample Data Files
+
+#### test_data.json
+```json
+{
+  "message": "Hello from mock API",
+  "timestamp": 1234567890,
+  "items": [
+    {"id": 1, "name": "Item 1"},
+    {"id": 2, "name": "Item 2"},
+    {"id": 3, "name": "Item 3"}
+  ]
+}
+```
+
+#### matrix_messages.json
+Contains sample Matrix chat room messages with realistic structure for testing chat integrations.
+
+## Configuration
+
+### Environment Variables
+- `PYTHONUNBUFFERED=1` - Enable real-time Python output in Docker
+
+### Docker Compose Configuration
+- **Host Port:** 5002
+- **Container Port:** 5000
+- **Volume Mount:** `./api_data:/app/api_data`
+- **Restart Policy:** `unless-stopped`
+
+### Health Check
+Docker includes automatic health checking via curl to `/health` endpoint.
+
+## Integration with N8N
+
+### HTTP Request Node Configuration
+```
+Method: GET
+URL: http://host.docker.internal:5002/data/test_data
+```
+
+### Webhook Testing
+Use the mock API to provide consistent test data for webhook development and testing.
+
+### Data Processing Workflows
+Test data transformation nodes with predictable input from the mock API.
+
+## Development
+
+### Adding New Endpoints
+Edit `mock_api_server.py` and add new Flask routes. The server will automatically restart in development mode.
+
+### Debugging
+Check container logs:
+```bash
+docker compose logs -f mock-api
+```
+
+### Stopping the Server
+```bash
+docker compose down
+```
+
+## Troubleshooting
+
+### Port Already in Use
+If port 5002 is occupied, edit `docker-compose.yml` and change the host port:
+```yaml
+ports:
+  - "5003:5000"  # Change 5002 to 5003
+```
+
+### File Permissions
+Ensure the `api_data` directory is writable for file uploads:
+```bash
+chmod 755 api_data/
+```
+
+### Container Not Starting
+Check if all required files are present:
+```bash
+ls -la mock_api_server.py Dockerfile docker-compose.yml api_data/
+```
+
+## Related Files
+
+- **Main Server Script:** `/home/klas/claude_n8n/tools/mock_api_server.py`
+- **N8N Tools Directory:** `/home/klas/claude_n8n/tools/`
+- **Original Development Files:** `/home/klas/mem0/.claude/` (can be removed after migration)