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

frontend-vue/tests/notification-bell.test.ts

@@ -3,10 +3,12 @@ import assert from 'node:assert/strict'
 import {
   formatNotificationTime,
   formatUnreadBadge,
+  groupNotificationsByDay,
   hasNewNotification,
   readLastNotifiedId,
   writeLastNotifiedId,
 } from '../src/shared/utils/notification-bell.ts'
+import { buildNotificationListQuery } from '../src/shared/api/types/modules/notification.ts'
 
 function createStorage() {
   const store = new Map<string, string>()
@@ -84,3 +86,75 @@ test('formatNotificationTime 今天/昨天/更早展示', () => {
   assert.equal(formatNotificationTime(null, now), '')
   assert.equal(formatNotificationTime('not-a-date', now), '')
 })
+
+test('groupNotificationsByDay 按年月日分组：今天/昨天/更早，组内保持原顺序', () => {
+  const now = new Date(2026, 8, 13, 15, 30)
+  const items = [
+    { id: 4, createdAt: new Date(2026, 8, 13, 15, 0).toISOString() },
+    { id: 3, createdAt: new Date(2026, 8, 13, 9, 0).toISOString() },
+    { id: 2, createdAt: new Date(2026, 8, 12, 23, 0).toISOString() },
+    { id: 1, createdAt: new Date(2026, 8, 1, 8, 0).toISOString() },
+  ]
+
+  const groups = groupNotificationsByDay(items, now)
+
+  assert.equal(groups.length, 3)
+  assert.deepEqual(
+    groups.map((group) => [group.day, group.label]),
+    [
+      ['2026-09-13', '今天'],
+      ['2026-09-12', '昨天'],
+      ['2026-09-01', '2026年9月1日'],
+    ],
+  )
+  assert.deepEqual(
+    groups[0].items.map((item) => item.id),
+    [4, 3],
+    '同一天的多条合为一组且保持倒序',
+  )
+})
+
+test('groupNotificationsByDay 时间缺失/非法归入未知时间组', () => {
+  const now = new Date(2026, 8, 13, 15, 30)
+  const groups = groupNotificationsByDay(
+    [
+      { id: 2, createdAt: null },
+      { id: 1, createdAt: 'not-a-date' },
+    ],
+    now,
+  )
+
+  assert.equal(groups.length, 1)
+  assert.equal(groups[0].day, '')
+  assert.equal(groups[0].label, '未知时间')
+  assert.deepEqual(
+    groups[0].items.map((item) => item.id),
+    [2, 1],
+  )
+})
+
+test('buildNotificationListQuery：关键字去空白、空条件不下发、日期原样透传', () => {
+  assert.deepEqual(buildNotificationListQuery(), { page: 1, pageSize: 20, onlyUnread: 'false' })
+
+  const query = buildNotificationListQuery({
+    page: 2,
+    pageSize: 10,
+    keyword: '  余额不足  ',
+    startDate: '2026-09-10',
+    endDate: '2026-09-13',
+  })
+  assert.deepEqual(query, {
+    page: 2,
+    pageSize: 10,
+    onlyUnread: 'false',
+    keyword: '余额不足',
+    startDate: '2026-09-10',
+    endDate: '2026-09-13',
+  })
+
+  // 面板清空筛选后不能带空串日期（后端日期绑定会 400）
+  const cleared = buildNotificationListQuery({ keyword: '   ', startDate: '', endDate: '' })
+  assert.equal('keyword' in cleared, false)
+  assert.equal('startDate' in cleared, false)
+  assert.equal('endDate' in cleared, false)
+})