feat(floorplan): 新增机房平面图功能模块

refactor(models): 为Room和Rack模型添加布局相关字段
feat(routes): 实现机房平面图相关API接口
feat(components): 添加平面图编辑器、画布渲染及交互组件
feat(hooks): 实现平面图数据管理和状态管理
feat(pages): 新增机房平面图页面入口
style(components): 优化平面图组件样式和交互体验

backend/models/index.js

@@ -0,0 +1,26 @@
+const Room = require('./Room');
+const Rack = require('./Rack');
+const Device = require('./Device');
+const DeviceField = require('./DeviceField');
+const DevicePort = require('./DevicePort');
+const NetworkCard = require('./NetworkCard');
+const Cable = require('./Cable');
+const Ticket = require('./Ticket');
+const InventoryRecord = require('./InventoryRecord');
+const Warehouse = require('./Warehouse');
+
+// 建立Rack与Device的关联关系（Device模型中已有反向关联定义）
+Rack.hasMany(Device, { foreignKey: 'rackId', as: 'Devices' });
+
+module.exports = {
+  Room,
+  Rack,
+  Device,
+  DeviceField,
+  DevicePort,
+  NetworkCard,
+  Cable,
+  Ticket,
+  InventoryRecord,
+  Warehouse,
+};