新增小程序后端代码，包括数据库、路由、服务层等。

小程序前后端打通，包括登录、注册、绑定设备、查询绑定信息，修改小朋友名称等功能。

banban-mini/src/pages/login/index.tsx

@@ -1,51 +1,118 @@
 import { View, Text, Button } from '@tarojs/components'
 import { useEffect } from 'react'
 import Taro from '@tarojs/taro'
+import { BASE_URL, request } from '@/services/api'
 import './index.scss'
 
 export default function Login() {
   useEffect(() => {
-    // 检查是否已登录
-    const isLoggedIn = Taro.getStorageSync('isLoggedIn')
-    
-    if (isLoggedIn) {
-      // 已登录，跳转到首页
+    console.log('[Login] Page mounted, checking token...')
+    const token = Taro.getStorageSync('token')
+    console.log('[Login] Token exists:', !!token)
+    if (token) {
+      console.log('[Login] Already logged in, redirecting to device page')
       Taro.reLaunch({ url: '/pages/device/index' })
     }
   }, [])
 
-  const handleLogin = () => {
-    Taro.showLoading({ title: '登录中...' })
-    
-    // 调用微信登录
-    Taro.login({
-      success: (loginRes) => {
-        console.log('微信登录成功:', loginRes)
-        
-        // 模拟后端验证 - 实际项目中需要将code发送到服务器
-        // 这里假设登录成功
-        Taro.setStorageSync('isLoggedIn', true)
-        Taro.setStorageSync('userInfo', {
-          nickName: '微信家长',
-          avatarUrl: '',
-          isAdmin: true,
-          openid: loginRes.code
+  const doWeChatLogin = async () => {
+    try {
+      console.log('[Login] Starting WeChat login...')
+      Taro.showLoading({ title: '登录中...' })
+
+      // 1. 调用微信登录获取 code
+      console.log('[Login] Step 1: Calling Taro.login()...')
+      const loginRes = await Taro.login()
+      const code = loginRes.code
+      console.log('[Login] Got code:', code ? 'yes' : 'no')
+
+      // 2. 获取用户头像信息 (可选)
+      let userInfo = null
+      try {
+        console.log('[Login] Step 2: Calling Taro.getUserProfile()...')
+        const profileRes = await Taro.getUserProfile({
+          desc: '用于完善用户资料'
         })
-        
-        Taro.hideLoading()
-        
-        // 登录成功后跳转到首页
+        userInfo = profileRes.userInfo
+        console.log('[Login] Got userInfo:', !!userInfo)
+      } catch (e) {
+        console.log('[Login] getUserProfile failed (expected if user denied):', e)
+      }
+
+      // 3. 调用后端登录接口 (微信登录)
+      console.log('[Login] Step 3: Calling backend /auth/login...')
+      const res = await request<{ access_token: string; expires_in: number; user_id: number }>('/auth/login', {
+        method: 'POST',
+        data: {
+          code: code,  // 微信 code
+          nickname: userInfo?.nickName,
+          avatar_url: userInfo?.avatarUrl
+        }
+      })
+      console.log('[Login] Backend login success, user_id:', res.user_id)
+
+      // 4. 保存 token 和用户信息
+      console.log('[Login] Step 4: Saving token and user info...')
+      Taro.setStorageSync('token', res.access_token)
+      Taro.setStorageSync('user_id', res.user_id)
+      Taro.setStorageSync('expires_in', res.expires_in)
+      
+      // 保存用户信息用于显示
+      if (userInfo) {
+        Taro.setStorageSync('userInfo', {
+          nickname: userInfo.nickName,
+          avatar_url: userInfo.avatarUrl
+        })
+      }
+
+      // 5. 如果获取到了用户信息，发送到后端更新
+      if (userInfo) {
+        console.log('[Login] Step 5: Updating user profile...')
+        try {
+          await request(`/parents/${res.user_id}`, {
+            method: 'PATCH',
+            data: {
+              nickname: userInfo.nickName,
+              avatar_url: userInfo.avatarUrl
+            }
+          })
+        } catch (e) {
+          console.log('[Login] Update user profile failed:', e)
+        }
+      }
+
+      Taro.hideLoading()
+      console.log('[Login] Step 6: Login complete, showing success toast')
+      Taro.showToast({ title: '登录成功', icon: 'success' })
+
+      // 6. 跳转到首页
+      console.log('[Login] Redirecting to /pages/device/index...')
+      setTimeout(() => {
         Taro.reLaunch({ url: '/pages/device/index' })
-      },
-      fail: (err) => {
-        Taro.hideLoading()
-        console.error('微信登录失败:', err)
+      }, 500)
+
+    } catch (err: any) {
+      Taro.hideLoading()
+      console.error('[Login] Login failed:', err)
+
+      // 如果是 401 错误，尝试通过创建新用户登录
+      if (err.status === 401) {
         Taro.showToast({
           title: '登录失败，请重试',
           icon: 'none'
         })
+      } else {
+        Taro.showToast({
+          title: err.message || '网络错误，请重试',
+          icon: 'none'
+        })
       }
-    })
+    }
+  }
+
+  const handleLogin = () => {
+    console.log('Button clicked, starting login...')
+    doWeChatLogin()
   }
 
   return (
@@ -77,8 +144,7 @@ export default function Login() {
         <View className='login-btn-wrapper'>
           <Button 
             className='login-btn' 
-            openType='getUserInfo'
-            onGetUserInfo={handleLogin}
+            onClick={handleLogin}
           >
             <Text className='btn-icon'>🌐</Text>
             <Text className='btn-text'>微信一键登录</Text>