fix: 审查修复波次（P0x4 + P1x30+）

- domain/rules: 计分与排名解耦、破纪录按组别、tieBreak 生效、调整分不丢、移除 aggregate 假能力
- realtime: 新建 internal/dto，快照三项契约对齐，/ws 只认会话身份
- httpapi: 流水幂等、standings 整表载荷、广播接线、强制改密、XFF 防伪造、records 写入、审计、赛事包内容、发布前备份、result.points、实例列表
- web: FormData 上传、YAML 解析、快照归一化、大屏解析层、bootstrap 降级、访客判定、主题切换
- console: 优雅关闭握手、中文化、免验证改管理员账号、选屏与日志轮转修复
- docs: 用户文档三份 + README
- 主代理: 破纪录加分接线（levels 未加载导致恒 0）

web/src/admin/layouts/AdminLayout.vue

@@ -4,6 +4,7 @@ import { RouterLink, RouterView, useRoute, useRouter } from 'vue-router'
 import MxIcon from '../components/MxIcon.vue'
 import ToastHost from '../components/ToastHost.vue'
 import type { IconName } from '../components/icons'
+import { theme, toggleTheme } from '../theme'
 import { useAuthStore } from '../stores/auth'
 import { useEventStore } from '../stores/event'
 import { useToastStore } from '../stores/toast'
@@ -65,6 +66,7 @@ const refreshing = ref(false)
 
 const currentTitle = computed(() => (typeof route.meta.title === 'string' ? route.meta.title : '管理面板'))
 const pendingCount = computed(() => data.events.filter((event) => event.status === 'pending').length)
+const themeToggleLabel = computed(() => (theme.value === 'dark' ? '切换到浅色模式' : '切换到深色模式'))
 
 const connection = computed(() => {
   if (data.isMock) return { tone: 'warning', text: '示例数据', hint: data.mockLabel ?? '' }
@@ -153,6 +155,16 @@ onMounted(async () => {
             {{ connection.text }}
           </span>
           <span v-if="data.serverHealth" class="version mono">v{{ data.serverHealth }}</span>
+          <button
+            class="mx-btn mx-btn-ghost mx-btn-icon"
+            type="button"
+            :title="themeToggleLabel"
+            :aria-label="themeToggleLabel"
+            :aria-pressed="theme === 'light'"
+            @click="toggleTheme()"
+          >
+            <MxIcon name="display" :size="17" />
+          </button>
           <button
             class="mx-btn mx-btn-ghost mx-btn-icon"
             type="button"