feat: 管理后台用户详情页增加订阅状态和测试消息发送

- 后端新增 /api/admin/users/:id 返回用户订阅列表
- 后端新增 POST /api/admin/users/:id/test-message 发送测试订阅消息
- 前端用户详情页展示订阅状态（只读，按类型分组）
- 前端增加发送版本更新测试消息功能

public/admin/index.html

@@ -67,6 +67,9 @@ tr:hover td { background: #f8f9fa; }
 .badge-vip { background: #e8f0fe; color: #1967d2; }
 .btn-detail { padding: 4px 12px; background: var(--primary); color: #fff; border: none; border-radius: 4px; font-size: 12px; cursor: pointer; }
 .btn-detail:hover { background: var(--primary-hover); }
+.btn-send-msg { padding: 8px 16px; background: var(--primary); color: #fff; border: none; border-radius: 6px; font-size: 14px; cursor: pointer; white-space: nowrap; }
+.btn-send-msg:hover { background: var(--primary-hover); }
+.btn-send-msg:disabled { opacity: .6; cursor: not-allowed; }
 
 /* Pagination */
 .pagination { padding: 16px 20px; display: flex; justify-content: center; align-items: center; gap: 12px; }
@@ -355,6 +358,7 @@ async function openModal(id) {
   try {
     const d = await api('/api/admin/users/' + id);
     S.editingUser = d.data;
+    S.subscriptions = d.subscriptions || [];
     renderModal(d.data);
   } catch (e) {
     showToast('加载用户详情失败', false);
@@ -404,7 +408,81 @@ function renderModal(u) {
     <div class="field-row">
       <div class="field"><label>平台限额</label><input type="number" id="edit-platformLimit" value="${u.platformLimit || 0}" min="0"></div>
       <div class="field"><label>当前平台数</label><input type="number" id="edit-platformCount" value="${u.platformCount || 0}" min="0"></div>
+    </div>
+    <hr style="border:none;border-top:1px solid var(--border);margin:16px 0">
+    <div class="field"><label>订阅通知状态（只读）</label><div id="subscribeStatus" class="ro">加载中...</div></div>
+    <hr style="border:none;border-top:1px solid var(--border);margin:16px 0">
+    <div class="field"><label>发送测试消息</label>
+      <div style="display:flex;gap:8px;align-items:center;flex-wrap:wrap">
+        <input id="test-tplId" value="DaPPZVFsLsHzj6TJAFK5rUp8B4DW-9JOtJF00v-uLMQ" style="flex:1;min-width:180px" placeholder="模板ID">
+        <input id="test-str1" value="v2.0" style="width:100px" placeholder="character_string1">
+        <input id="test-t3" value="版本已更新" style="width:100px" placeholder="thing3">
+        <input id="test-t6" value="请查看更新内容" style="width:120px" placeholder="thing6">
+        <button class="btn-send-msg" onclick="sendTestMessage()">发送测试</button>
+      </div>
+      <div id="testResult" style="margin-top:8px"></div>
     </div>`;
+  if (S.subscriptions) {
+    renderSubscriptions(S.subscriptions);
+  }
+}
+
+function renderSubscriptions(subs) {
+  const el = document.getElementById('subscribeStatus');
+  if (!subs || subs.length === 0) {
+    el.innerHTML = '<span style="color:var(--text-secondary)">该用户未订阅任何通知</span>';
+    return;
+  }
+  const typeMap = {};
+  subs.forEach(s => {
+    if (!typeMap[s.type]) typeMap[s.type] = [];
+    typeMap[s.type].push(s);
+  });
+  let html = '<div style="font-size:13px">';
+  for (const [type, items] of Object.entries(typeMap)) {
+    const latest = items[0];
+    const badgeClass = latest.status === 'active' ? 'badge-active' : (latest.status === 'used' ? 'badge-inactive' : 'badge-banned');
+    const label = latest.status === 'active' ? '已授权' : (latest.status === 'used' ? '已使用' : latest.status);
+    const typeName = type === 'version-update' ? '版本更新通知' : (type === 'expiry-reminder' ? '到期提醒通知' : type);
+    html += `<div style="margin-bottom:8px">
+      <span class="badge ${badgeClass}">${label}</span>
+      <span style="margin-left:8px">${typeName}</span>
+      <span style="margin-left:8px;color:var(--text-secondary)">模板: ${latest.templateId.substring(0,8)}...</span>
+      <span style="margin-left:8px;color:var(--text-secondary)">订阅: ${fmtDate(latest.subscribedAt)}</span>
+    </div>`;
+  }
+  html += '</div>';
+  el.innerHTML = html;
+}
+
+async function sendTestMessage() {
+  if (!S.editingUser) return;
+  const btn = document.querySelector('.btn-send-msg');
+  const resultEl = document.getElementById('testResult');
+  btn.disabled = true;
+  btn.textContent = '发送中...';
+  resultEl.innerHTML = '';
+  try {
+    const res = await api('/api/admin/users/' + S.editingUser._id + '/test-message', {
+      method: 'POST',
+      body: JSON.stringify({
+        templateId: document.getElementById('test-tplId').value.trim(),
+        character_string1: document.getElementById('test-str1').value.trim(),
+        thing3: document.getElementById('test-t3').value.trim(),
+        thing6: document.getElementById('test-t6').value.trim()
+      })
+    });
+    if (res.success) {
+      resultEl.innerHTML = `<span style="color:#137333">✅ 发送成功 (msgid: ${res.data.messageId})</span>`;
+    } else {
+      resultEl.innerHTML = `<span style="color:var(--danger)">❌ 发送失败: errcode=${res.data.errcode} ${res.data.errmsg || ''}</span>`;
+    }
+  } catch (e) {
+    resultEl.innerHTML = `<span style="color:var(--danger)">❌ 异常: ${e.message}</span>`;
+  } finally {
+    btn.disabled = false;
+    btn.textContent = '发送测试';
+  }
 }
 
 function toggleVipExpire() {