refactor: 重构邮箱验证模块并修复代码审查问题

- 重构: 将 verification 模块重命名为 email，目录结构更清晰
- 新增: 独立的邮件配置管理页面 (EmailSettings.vue)
- 新增: 邮件模板管理功能（支持自定义 HTML 模板和预览）
- 新增: 查询验证状态 API，支持页面刷新后恢复验证流程
- 新增: 注册邮箱后缀白名单/黑名单限制功能
- 修复: 统一密码最小长度为 6 位（前后端一致）
- 修复: SMTP 连接添加 30 秒超时配置，防止 worker 挂起
- 修复: 邮件模板变量添加 HTML 转义，防止 XSS
- 修复: 验证状态清除改为 db.commit 后执行，避免竞态条件
- 优化: RegisterDialog 重写验证码输入组件，提升用户体验
- 优化: Input 组件支持 disableAutofill 属性

frontend/src/api/admin.ts

@@ -124,6 +124,37 @@ export interface ModelExport {
   config?: any
 }
 
+// 邮件模板接口
+export interface EmailTemplateInfo {
+  type: string
+  name: string
+  variables: string[]
+  subject: string
+  html: string
+  is_custom: boolean
+  default_subject?: string
+  default_html?: string
+}
+
+export interface EmailTemplatesResponse {
+  templates: EmailTemplateInfo[]
+}
+
+export interface EmailTemplatePreviewResponse {
+  html: string
+  variables: Record<string, string>
+}
+
+export interface EmailTemplateResetResponse {
+  message: string
+  template: {
+    type: string
+    name: string
+    subject: string
+    html: string
+  }
+}
+
 // Provider 模型查询响应
 export interface ProviderModelsQueryResponse {
   success: boolean
@@ -395,5 +426,52 @@ export const adminApi = {
       config
     )
     return response.data
+  },
+
+  // 邮件模板相关
+  // 获取所有邮件模板
+  async getEmailTemplates(): Promise<EmailTemplatesResponse> {
+    const response = await apiClient.get<EmailTemplatesResponse>('/api/admin/system/email/templates')
+    return response.data
+  },
+
+  // 获取指定类型的邮件模板
+  async getEmailTemplate(templateType: string): Promise<EmailTemplateInfo> {
+    const response = await apiClient.get<EmailTemplateInfo>(
+      `/api/admin/system/email/templates/${templateType}`
+    )
+    return response.data
+  },
+
+  // 更新邮件模板
+  async updateEmailTemplate(
+    templateType: string,
+    data: { subject?: string; html?: string }
+  ): Promise<{ message: string }> {
+    const response = await apiClient.put<{ message: string }>(
+      `/api/admin/system/email/templates/${templateType}`,
+      data
+    )
+    return response.data
+  },
+
+  // 预览邮件模板
+  async previewEmailTemplate(
+    templateType: string,
+    data?: { html?: string } & Record<string, string>
+  ): Promise<EmailTemplatePreviewResponse> {
+    const response = await apiClient.post<EmailTemplatePreviewResponse>(
+      `/api/admin/system/email/templates/${templateType}/preview`,
+      data || {}
+    )
+    return response.data
+  },
+
+  // 重置邮件模板为默认值
+  async resetEmailTemplate(templateType: string): Promise<EmailTemplateResetResponse> {
+    const response = await apiClient.post<EmailTemplateResetResponse>(
+      `/api/admin/system/email/templates/${templateType}/reset`
+    )
+    return response.data
   }
 }

frontend/src/api/auth.ts

@@ -51,6 +51,18 @@ export interface VerifyEmailResponse {
   success: boolean
 }
 
+export interface VerificationStatusRequest {
+  email: string
+}
+
+export interface VerificationStatusResponse {
+  email: string
+  has_pending_code: boolean
+  is_verified: boolean
+  cooldown_remaining: number | null
+  code_expires_in: number | null
+}
+
 export interface RegisterRequest {
   email: string
   username: string
@@ -67,7 +79,6 @@ export interface RegisterResponse {
 export interface RegistrationSettingsResponse {
   enable_registration: boolean
   require_email_verification: boolean
-  verification_code_expire_minutes?: number
 }
 
 export interface User {
@@ -154,5 +165,13 @@ export const authApi = {
       '/api/auth/registration-settings'
     )
     return response.data
+  },
+
+  async getVerificationStatus(email: string): Promise<VerificationStatusResponse> {
+    const response = await apiClient.post<VerificationStatusResponse>(
+      '/api/auth/verification-status',
+      { email }
+    )
+    return response.data
   }
 }