feat: 邮箱验证码注册+登录协议勾选

- 后端: VerificationCode模型+send-code API+register增加verifyCode校验
- 前端: 注册表单增加验证码输入框+60s倒计时获取按钮
- 前端: 登录表单增加用户协议/隐私政策勾选
- 前端: 登录按钮增加disabled状态(未勾选时不可点击)
- 后端: nodemailer邮件发送工具(可配置SMTP,未配置时返回devCode)

server/src/models/User.js

@@ -53,13 +53,19 @@ const UserSchema = new Schema({
   },
   
   // H5环境用户名密码登录
-  username: {
-    type: String,
-    unique: true,
-    sparse: true,
-    index: true
-  },
-  password: {
+    username: {
+      type: String,
+      unique: true,
+      sparse: true,
+      index: true
+    },
+    email: {
+      type: String,
+      unique: true,
+      sparse: true,
+      index: true
+    },
+    password: {
     type: String,
     select: false
   },

server/src/models/VerificationCode.js

@@ -0,0 +1,15 @@
+const mongoose = require('mongoose')
+const { Schema } = mongoose
+
+const VerificationCodeSchema = new Schema({
+  email: { type: String, required: true, index: true },
+  code: { type: String, required: true },
+  expiresAt: { type: Date, required: true, index: true },
+  used: { type: Boolean, default: false },
+  createdAt: { type: Date, default: Date.now }
+})
+
+// 自动过期 TTL 索引（MongoDB 自动删除过期文档）
+VerificationCodeSchema.index({ expiresAt: 1 }, { expireAfterSeconds: 0 })
+
+module.exports = mongoose.model('VerificationCode', VerificationCodeSchema)

server/src/models/index.js

@@ -9,6 +9,7 @@ const AIModel = require('./AIModel')
 const LoginLog = require('./LoginLog')
 const Feedback = require('./Feedback')
 const Trend = require('./Trend')
+const VerificationCode = require('./VerificationCode')
 
 module.exports = {
   User,
@@ -21,5 +22,6 @@ module.exports = {
   AIModel,
   LoginLog,
   Feedback,
-  Trend
+  Trend,
+  VerificationCode
 }