feat(站内通知): 铃铛面板支持时间/内容搜索、按天分组与分页

- 列表接口加 keyword（标题/内容模糊）与 startDate/endDate（年月日闭区间）参数，
  两端控制器透传，服务端补筛选日志
- 两端铃铛面板：搜索框（防抖 300ms）+ 日期区间 + 按年月日分组 + 翻页，
  面板改 Teleport 到 body（挂在顶栏时会被页面 el-select 压住，提 z-index 无效）
- 固化可见范围回归测试：超管全量/管理员只看本组/普通用户只看自己，
  含读写两侧的 user_id+audience 裁剪断言与两端控制器身份来源断言

admin-frontend-vue/scripts/mock-admin-server.mjs

@@ -142,6 +142,57 @@ function json(res, payload, status = 200) {
   res.end(body)
 }
 
+/* ===================== 站内通知夹具（铃铛面板：搜索/按天分组/分页验收用） ===================== */
+const NOTIFICATIONS = [
+  ...[6, 5, 4, 3, 2, 1].map((seq) => notif(seq, '2026-09-13', 22, seq, seq <= 3)),
+  ...[4, 3, 2, 1].map((seq) => notif(20 + seq, '2026-09-12', 20, seq, true)),
+  ...[4, 3, 2, 1].map((seq) => notif(30 + seq, '2026-09-10', 18, seq, true)),
+]
+
+function notif(id, day, hour, seq, read) {
+  const minutes = String(seq * 7).padStart(2, '0')
+  return {
+    id,
+    scene: id % 3 === 0 ? 'secret_balance' : 'task_failed',
+    level: id % 3 === 0 ? 'error' : 'warning',
+    title: id % 3 === 0 ? `用户密钥异常：测试用户${seq}` : `跟价任务失败`,
+    content: id % 3 === 0 ? `用户 测试用户${seq}（uid=${1100 + seq}）的代理设置对应服务商余额不足` : `用户 测试用户${seq} 有 ${seq} 个跟价任务失败`,
+    read,
+    readAt: read ? `${day} ${hour}:${minutes}:00` : null,
+    createdAt: `${day} ${hour}:${minutes}:00`,
+  }
+}
+
+/** 通知列表：关键字匹配标题/内容，日期按年月日区间（与 Java 侧同语义）。 */
+function notificationPage(searchParams) {
+  const keyword = (searchParams.get('keyword') || '').trim()
+  const startDate = searchParams.get('startDate') || ''
+  const endDate = searchParams.get('endDate') || ''
+  const page = Math.max(1, Number(searchParams.get('page') || 1))
+  const pageSize = Math.min(100, Math.max(1, Number(searchParams.get('pageSize') || 20)))
+  let rows = NOTIFICATIONS
+  if (keyword) {
+    rows = rows.filter((item) => `${item.title}${item.content}`.includes(keyword))
+  }
+  if (startDate) {
+    rows = rows.filter((item) => item.createdAt.slice(0, 10) >= startDate)
+  }
+  if (endDate) {
+    rows = rows.filter((item) => item.createdAt.slice(0, 10) <= endDate)
+  }
+  const start = (page - 1) * pageSize
+  return {
+    success: true,
+    data: {
+      items: rows.slice(start, start + pageSize),
+      total: rows.length,
+      page,
+      pageSize,
+      unreadCount: rows.filter((item) => !item.read).length,
+    },
+  }
+}
+
 const server = createServer((req, res) => {
   const url = (req.url || '').split('?')[0]
   const method = req.method || 'GET'
@@ -180,6 +231,18 @@ const server = createServer((req, res) => {
       data: { pending: false, scanned_at: '2026-09-05 08:30:00', items: ALL_ROWS, total: ALL_ROWS.length, page: 1, page_size: 20 },
     })
   }
+  if (url === '/api/admin/notifications/summary') {
+    return json(res, {
+      success: true,
+      data: {
+        unreadCount: NOTIFICATIONS.filter((item) => !item.read).length,
+        latestId: NOTIFICATIONS.reduce((max, item) => Math.max(max, item.id), 0),
+      },
+    })
+  }
+  if (url === '/api/admin/notifications') {
+    return json(res, notificationPage(new URL(req.url || '/', 'http://127.0.0.1').searchParams))
+  }
   if (url.startsWith('/api/')) {
     return json(res, { success: true, data: { items: [], total: 0 } })
   }