feat: 公告持久化（底栏常驻）+ 团体可单独报名 + 榜单系数开关

公告：
- 服务端把当前公告落库到 settings（display.announce_text / announce_seconds），
  作为 display.announce 随 snapshot 与 /api/settings 下发（非 admin 快照也保留）
- announce 指令除转发外写库；新增 announce_clear 清空并广播；两者写审计
- realtime 协议登记 announce_clear（补上，使清除能即时推到大屏）
- 大屏把「全屏推送」与「底栏常驻」拆开：推送 seconds 秒后只退出全屏态，公告留在底栏，
  直到被替换或清除；新增公告状态机（可测）与底栏取值优先级
  推送中 > 服务端持久值 > 「暂无公告」；管理端加「清除公告」与当前公告状态

团体报名：
- EntryPicker 团体/对抗模式允许不勾队员直接报名该单位（此前必须勾人，导致
  「只想给单位报个团体项目」做不到、单位下没有运动员时完全报不了）
- 核实录入页团体行：显示/填名次/保存/发布/算分闭环无缺陷（用真实服务端跑过），
  抽出共享的 entryRowLabel 供两处复用

榜单口径：
- 基础数据 → 积分模板页新增「榜单口径（全局）」卡片：individualToTeamWeight
  数字输入（默认 1、0–100），说明「个人项目得分按该系数折算计入单位总分」，
  保存走 PUT /api/settings；因该值在服务端是全局键、模板表里没有此字段，
  故做成独立卡片并标注全局，不塞进模板表单

自检：服务端 11 包全绿；前端 vue-tsc + build、node --test 99/99。

web/src/admin/tests/base-data-settings.test.ts

@@ -0,0 +1,72 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import { createPinia, setActivePinia } from 'pinia'
+import type { EventSettings } from '@/shared'
+
+/**
+ * 榜单口径（standings.individual_to_team_weight）的保存契约。
+ *
+ * adminApi 的 http 实例在模块初始化时就绑定了 `globalThis.fetch`，所以这里先替换 fetch，
+ * 再用动态 import 拿到 store 与控制器，才能观察到真实请求的 URL / 方法与载荷。
+ */
+
+const SETTINGS: EventSettings = {
+  event: { name: '测试赛事', subtitle: null, host: null, logoPath: null, primaryColor: null },
+  display: { background: null, logo: null, title: '测试赛事', subtitle: null, primaryColor: null, rotateSeconds: 15 },
+  standings: {
+    individualToTeamWeight: 1,
+    rankingMode: 'points',
+    showIndividualBoard: true,
+    showIndividualMedals: true,
+  },
+  defaultProfileId: null,
+  requireApproval: false,
+}
+
+interface Captured {
+  url: string
+  method: string
+  body: Record<string, unknown> | null
+}
+
+function stubFetch(weight: number): Captured {
+  const captured: Captured = { url: '', method: '', body: null }
+  globalThis.fetch = (async (input: unknown, init?: RequestInit) => {
+    captured.url = String(input)
+    captured.method = init?.method ?? 'GET'
+    captured.body = init?.body === undefined ? null : (JSON.parse(String(init.body)) as Record<string, unknown>)
+    const data: EventSettings = { ...SETTINGS, standings: { ...SETTINGS.standings, individualToTeamWeight: weight } }
+    return new Response(JSON.stringify({ ok: true, data }), {
+      status: 200,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }) as typeof fetch
+  return captured
+}
+
+test('保存榜单口径 PUT /api/settings，提交完整 standings 并回写 event store', async () => {
+  const captured = stubFetch(0.5)
+  const { useEventStore } = await import('../stores/event')
+  const { useBaseData } = await import('../components/baseData/useBaseData')
+
+  setActivePinia(createPinia())
+  const event = useEventStore()
+  event.settings = { ...SETTINGS }
+  const data = useBaseData()
+
+  const saved = await data.saveIndividualToTeamWeight(0.5)
+
+  assert.equal(captured.url, '/api/settings')
+  assert.equal(captured.method, 'PUT')
+  const standings = captured.body?.standings as Record<string, unknown>
+  assert.equal(standings.individualToTeamWeight, 0.5)
+  // 只提交一个字段会把其余口径留在服务端旧值上，所以整个 standings 子对象原样回传。
+  assert.equal(standings.rankingMode, 'points')
+  assert.equal(standings.showIndividualBoard, true)
+  assert.equal(standings.showIndividualMedals, true)
+
+  assert.equal(saved.standings.individualToTeamWeight, 0.5)
+  // 成绩录入页与积分预览直接读 event store 的设置，不回写就等于「保存成功但预览没变」。
+  assert.equal(event.settings?.standings.individualToTeamWeight, 0.5)
+  assert.equal(data.settings.value?.standings.individualToTeamWeight, 0.5)
+})