完成了机柜可视化功能，鼠标悬停显示设备信息

backend/routes/devices.js

@@ -14,7 +14,7 @@ const DeviceField = require('../models/DeviceField');
 // 获取所有设备（支持搜索和筛选）
 router.get('/', async (req, res) => {
   try {
-    const { keyword, status, type, page = 1, pageSize = 10 } = req.query;
+    const { keyword, status, type, rackId, page = 1, pageSize = 10 } = req.query;
     const offset = (page - 1) * pageSize;
     
     // 构建查询条件
@@ -44,6 +44,11 @@ router.get('/', async (req, res) => {
       where.type = type;
     }
     
+    // 机柜筛选（用于机柜可视化功能）
+    if (rackId) {
+      where.rackId = rackId;
+    }
+    
     // 执行查询
     const { count, rows } = await Device.findAndCountAll({
       where,