feat: add Zigbee2MQTT network map importer

- Backend: async MQTT service (aiomqtt) to fetch Z2M networkmap via bridge API
- Backend: FastAPI router at /api/v1/zigbee with /import and /test-connection
- Backend: Pydantic v2 schemas for request/response validation
- Backend: coordinator → router → end-device parent_id hierarchy builder
- Frontend: ZigbeeImportModal with MQTT config form, Test Connection, Fetch Devices
- Frontend: device list grouped by type (coordinator/router/enddevice) with checkboxes
- Frontend: ZigbeeCoordinatorNode, ZigbeeRouterNode, ZigbeeEndDeviceNode canvas nodes
- Frontend: Zigbee Import button in sidebar alongside Scan Network
- Frontend: handleZigbeeAddToCanvas wires selected devices + edges onto canvas
- Tests: full unit test suite for parser, hierarchy builder, MQTT mocks
- Tests: API endpoint tests for /zigbee/import and /zigbee/test-connection
- Tests: Vitest component tests for ZigbeeImportModal
- Docs: docs/zigbee-import.md with full usage, MQTT config, troubleshooting guide
- Docs: README.md Zigbee2MQTT Import section

Co-authored-by: CyberKeys <noreply@openclaw.ai>

frontend/src/types/index.ts

@@ -19,6 +19,9 @@ export type NodeType =
   | 'generic'
   | 'groupRect'
   | 'group'
+  | 'zigbee_coordinator'
+  | 'zigbee_router'
+  | 'zigbee_enddevice'
 
 export type TextPosition =
   | 'top-left'
@@ -136,6 +139,9 @@ export const NODE_TYPE_LABELS: Record<NodeType, string> = {
   generic: 'Generic Device',
   groupRect: 'Group Rectangle',
   group: 'Node Group',
+  zigbee_coordinator: 'Zigbee Coordinator',
+  zigbee_router: 'Zigbee Router',
+  zigbee_enddevice: 'Zigbee End Device',
 }
 
 export const STATUS_COLORS: Record<NodeStatus, string> = {