refactor(backend): 将ApiUser模型重命名为Admin并更新相关引用

backend/routes/auth.js

@@ -5,7 +5,7 @@ const Joi = require('joi')
 const router = express.Router()
 
 // 引入数据库模型
-const { ApiUser } = require('../models')
+const { Admin } = require('../models')
 
 // 引入认证中间件
 const { authenticateJWT } = require('../middleware/auth')
@@ -118,9 +118,9 @@ router.post('/login', async (req, res) => {
     const { username, password } = value
     
     // 查找用户
-    const user = await ApiUser.findOne({
+    const user = await Admin.findOne({
       where: {
-        [ApiUser.sequelize.Op.or]: [
+        [Admin.sequelize.Op.or]: [
           { username },
           { email: username }
         ]
@@ -218,7 +218,7 @@ router.get('/me', authenticateJWT, async (req, res) => {
     const userId = req.user.id
     
     // 根据ID查找用户
-    const user = await ApiUser.findByPk(userId, {
+    const user = await Admin.findByPk(userId, {
       attributes: {
         exclude: ['password_hash'] // 排除密码哈希等敏感信息
       }