feat(mail): 多邮箱选择登录与申请，展示已申请数量（N/5）

src/api/mail.ts

@@ -17,7 +17,7 @@ export interface MailSessionConfig {
 
 /** 我的邮箱接口响应 */
 export interface MyMailboxResult {
-  Mailbox: MailboxInfo | null
+  MailboxList: MailboxInfo[]
   Session: MailSessionConfig
 }
 
@@ -66,12 +66,13 @@ export const mailApi = {
   apply: (data: { MailboxName: string; Password: string; QuotaMB?: number }): Promise<{ MailboxName: string; QuotaMB: number }> =>
     post<{ MailboxName: string; QuotaMB: number }>('/API/Mail/Apply', data),
 
-  /** 修改邮箱密码（需先验证当前密码） */
-  changePassword: (OldPassword: string, NewPassword: string): Promise<void> =>
-    post<void>('/API/Mail/ChangePassword', { OldPassword, NewPassword }),
+  /** 修改邮箱密码（需先验证当前密码；MailboxName 可选，多邮箱时指定，缺省取第一个） */
+  changePassword: (OldPassword: string, NewPassword: string, MailboxName?: string): Promise<void> =>
+    post<void>('/API/Mail/ChangePassword', { OldPassword, NewPassword, ...(MailboxName ? { MailboxName } : {}) }),
 
-  /** 邮箱登录：校验密码并换取会话 token（密码仅此一次传输，后端存内存；401 为密码错误，不触发系统登出） */
-  login: (Password: string): Promise<MailLoginResult> => post<MailLoginResult>('/API/Mail/Login', { Password }, { silent: true }),
+  /** 邮箱登录：校验密码并换取会话 token（密码仅此一次传输，后端存内存；401 为密码错误，不触发系统登出；MailboxName 可选，多邮箱时指定，缺省取第一个） */
+  login: (Password: string, MailboxName?: string): Promise<MailLoginResult> =>
+    post<MailLoginResult>('/API/Mail/Login', { Password, ...(MailboxName ? { MailboxName } : {}) }, { silent: true }),
 
   /** 邮箱登出：吊销会话 token */
   logout: (Token: string): Promise<void> => post<void>('/API/Mail/Logout', { Token }),

src/views/mail/Mailbox.vue

@@ -26,7 +26,8 @@ import { JmapClient, JmapAuthError, type JmapMailbox, type JmapEmail } from '@/u
 // === 状态 ===
 
 const loading = ref(true)
-const mailbox = ref<MailboxInfo | null>(null)
+const myMailboxes = ref<MailboxInfo[]>([])
+const selectedMailbox = ref<MailboxInfo | null>(null)
 const session = ref<MailSessionConfig | null>(null)
 
 // 申请表单
@@ -71,7 +72,9 @@ const contactSaving = ref(false)
 const changePwdVisible = ref(false)
 const changePwdForm = ref({ OldPassword: '', NewPassword: '', ConfirmPassword: '' })
 
-const myAddress = computed(() => mailbox.value?.MailboxName || '')
+const myAddress = computed(() => selectedMailbox.value?.MailboxName || '')
+const mailboxCount = computed(() => myMailboxes.value.length)
+const atMailboxLimit = computed(() => myMailboxes.value.length >= 5)
 
 // === 本地已读覆盖 ===
 // Stalwart v0.11 存在 JMAP keywords 写入已知 bug（GitHub #1139）：setSeen 返回成功但已读随机回退未读，
@@ -107,7 +110,7 @@ const MAIL_NAME_KEY = 'gerp_mail_name'
 
 function saveMailSession(token: string): void {
   localStorage.setItem(MAIL_TOKEN_KEY, token)
-  localStorage.setItem(MAIL_NAME_KEY, mailbox.value?.MailboxName || '')
+  localStorage.setItem(MAIL_NAME_KEY, selectedMailbox.value?.MailboxName || '')
 }
 
 function clearMailSession(): void {
@@ -129,10 +132,10 @@ function handleMailSessionExpired(): void {
 
 /** 恢复上次邮箱会话：localStorage 中的 token 直接连接 JMAP，失效则自动清除 */
 async function restoreSession(): Promise<void> {
-  if (!mailbox.value || client.value) return
+  if (!selectedMailbox.value || client.value) return
   const token = localStorage.getItem(MAIL_TOKEN_KEY)
   const name = localStorage.getItem(MAIL_NAME_KEY)
-  if (!token || name !== mailbox.value.MailboxName) return
+  if (!token || name !== selectedMailbox.value.MailboxName) return
   restoring.value = true
   try {
     const c = new JmapClient(name, token, handleMailSessionExpired)
@@ -151,7 +154,11 @@ async function restoreSession(): Promise<void> {
 async function init(): Promise<void> {
   try {
     const result = await mailApi.myMailbox()
-    mailbox.value = result.Mailbox
+    myMailboxes.value = result.MailboxList || []
+    // 保留当前选中邮箱；无选中或已不在列表则取第一个启用邮箱
+    if (!selectedMailbox.value || !myMailboxes.value.some((m) => m.MailboxName === selectedMailbox.value?.MailboxName)) {
+      selectedMailbox.value = myMailboxes.value.find((m) => m.Status === 1) || myMailboxes.value[0] || null
+    }
     session.value = result.Session
   } catch {
     // 拦截器已提示
@@ -194,7 +201,7 @@ async function submitApply(): Promise<void> {
 // === 登录 JMAP ===
 
 async function submitLogin(): Promise<void> {
-  if (!mailbox.value || !session.value) return
+  if (!selectedMailbox.value || !session.value) return
   if (!loginForm.value.Password) {
     ElMessage.warning('请输入邮箱密码')
     return
@@ -202,7 +209,7 @@ async function submitLogin(): Promise<void> {
   connecting.value = true
   try {
     // 后端校验密码并签发会话 token（密码仅此一次传输，后端存内存；后续 JMAP 调用只带 token）
-    const result = await mailApi.login(loginForm.value.Password)
+    const result = await mailApi.login(loginForm.value.Password, selectedMailbox.value.MailboxName)
     const c = new JmapClient(result.MailboxName, result.Token, handleMailSessionExpired)
     await c.discover()
     client.value = c
@@ -617,7 +624,7 @@ async function submitChangePassword(): Promise<void> {
     return
   }
   try {
-    await mailApi.changePassword(f.OldPassword, f.NewPassword)
+    await mailApi.changePassword(f.OldPassword, f.NewPassword, selectedMailbox.value?.MailboxName)
     ElMessage.success('密码修改成功，请重新登录邮箱')
     changePwdVisible.value = false
     changePwdForm.value = { OldPassword: '', NewPassword: '', ConfirmPassword: '' }
@@ -704,12 +711,12 @@ function isSelected(id: string): boolean {
   <div class="mail-page">
     <div v-loading="loading" class="mail-container">
       <!-- 未申请邮箱 -->
-      <el-empty v-if="!loading && !mailbox" description="您还没有企业邮箱">
+      <el-empty v-if="!loading && !myMailboxes.length" description="您还没有企业邮箱">
         <el-button type="primary" @click="applyVisible = true">申请邮箱</el-button>
       </el-empty>
 
       <!-- 已申请：企业邮箱登录页 -->
-      <template v-else-if="mailbox && !client">
+      <template v-else-if="selectedMailbox && !client">
         <div v-loading="restoring" class="mail-login-wrap">
           <div class="mail-login-card">
             <div class="login-brand">
@@ -717,7 +724,21 @@ function isSelected(id: string): boolean {
               <div class="login-title">企业邮箱</div>
               <div class="login-subtitle">GVSDS · 银河锋锐 企业级邮件服务</div>
             </div>
-            <div class="login-address">
+            <el-select
+              v-if="myMailboxes.length > 1"
+              v-model="selectedMailbox"
+              class="login-address-select"
+              placeholder="选择要登录的邮箱"
+            >
+              <el-option
+                v-for="m in myMailboxes"
+                :key="m.MailboxName"
+                :value="m"
+                :label="m.MailboxName"
+                :disabled="m.Status !== 1"
+              />
+            </el-select>
+            <div v-else class="login-address">
               <el-icon><User /></el-icon>
               <span>{{ myAddress }}</span>
             </div>
@@ -737,16 +758,21 @@ function isSelected(id: string): boolean {
             <div class="login-links">
               <el-button text size="small" @click="changePwdVisible = true">修改密码</el-button>
               <span class="link-divider" />
+              <el-button text size="small" :disabled="atMailboxLimit" @click="applyVisible = true">申请新邮箱</el-button>
+              <span class="link-divider" />
               <el-button text size="small" type="danger" @click="logoutMail">退出当前邮箱</el-button>
             </div>
-            <div class="login-tip">登录后即可网页收发邮件，也可在 Outlook 等客户端配置使用</div>
+            <div class="login-tip">
+              {{ mailboxCount >= 5 ? '已达邮箱数量上限（5 个）' : `已申请 ${mailboxCount} / 5 个邮箱` }}
+              · 登录后即可网页收发邮件，也可在 Outlook 等客户端配置使用
+            </div>
           </div>
           <div class="login-footer">© 2026 GVSDS 企业邮箱 · 银河锋锐</div>
         </div>
       </template>
 
       <!-- 已登录 JMAP：三栏工作台 -->
-      <template v-else-if="mailbox && client">
+      <template v-else-if="selectedMailbox && client">
         <div class="mail-shell">
           <!-- 左栏：文件夹 -->
           <aside class="mail-sidebar">
@@ -889,7 +915,11 @@ function isSelected(id: string): boolean {
     </div>
 
     <!-- 申请邮箱弹窗 -->
-    <el-dialog v-model="applyVisible" title="申请企业邮箱" width="420px">
+    <el-dialog
+      v-model="applyVisible"
+      :title="`申请企业邮箱${mailboxCount ? `（已申请 ${mailboxCount} / 5）` : ''}`"
+      width="420px"
+    >
       <el-form label-width="80px">
         <el-form-item label="邮箱名">
           <el-input v-model="applyForm.MailboxName" placeholder="如 zhangsan" maxlength="63">
@@ -1058,6 +1088,9 @@ function isSelected(id: string): boolean {
   text-overflow: ellipsis;
   white-space: nowrap;
 }
+.login-address-select {
+  width: 100%;
+}
 .login-submit {
   width: 100%;
   height: 42px;