基本功能完成，下一步开始美化UI

api/controllers/userGroupController.ts

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+import { Request, Response } from 'express';
+import { UserGroupModel } from '../models/userGroup';
+
+export const userGroupController = {
+  // 获取所有用户组
+  getAll: async (req: Request, res: Response) => {
+    try {
+      const groups = await UserGroupModel.findAll();
+      res.json(groups);
+    } catch (error: any) {
+      res.status(500).json({ error: error.message });
+    }
+  },
+
+  // 创建用户组
+  create: async (req: Request, res: Response) => {
+    try {
+      const { name, description } = req.body;
+      if (!name) {
+        return res.status(400).json({ error: '用户组名称不能为空' });
+      }
+      
+      const group = await UserGroupModel.create({ name, description });
+      res.status(201).json(group);
+    } catch (error: any) {
+      res.status(400).json({ error: error.message });
+    }
+  },
+
+  // 更新用户组
+  update: async (req: Request, res: Response) => {
+    try {
+      const { id } = req.params;
+      const { name, description } = req.body;
+      
+      const group = await UserGroupModel.update(id, { name, description });
+      res.json(group);
+    } catch (error: any) {
+      res.status(400).json({ error: error.message });
+    }
+  },
+
+  // 删除用户组
+  delete: async (req: Request, res: Response) => {
+    try {
+      const { id } = req.params;
+      await UserGroupModel.delete(id);
+      res.json({ message: '用户组删除成功' });
+    } catch (error: any) {
+      res.status(400).json({ error: error.message });
+    }
+  },
+
+  // 获取用户组成员
+  getMembers: async (req: Request, res: Response) => {
+    try {
+      const { id } = req.params;
+      const members = await UserGroupModel.getMembers(id);
+      res.json(members);
+    } catch (error: any) {
+      res.status(500).json({ error: error.message });
+    }
+  }
+};