feat: add Portainer Edge MCP server
- Implement comprehensive edge computing functionality
- Add edge environment management (list, get, status, generate keys)
- Add edge stack operations (list, get, create, update, delete)
- Add edge group management (list, get, create, update, delete)
- Add edge job scheduling (list, get, create, delete)
- Add edge settings configuration (get, update)
- Create test scripts for edge API validation
- Add comprehensive README documentation for edge server
- Include nginx stack creation script from earlier testing
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Co-Authored-By: Claude <noreply@anthropic.com>