feat(player): theme-3 移动端/PC 双端拆分与桌面投注工作台

新增 DesktopShell 及桌面端首页、赛事、钱包、记录等页面，原 H5 视图迁移至 Mobile* 并由路由 wrapper 按视口切换。补齐右侧投注单栏、赔率快捷浮层、联赛/赛事侧栏、串关与定位能力；桌面下注成功改为全局 Toast，修复侧栏成功遮罩被裁剪与底部汇总黑底。同步悬浮客服、公告卡片、三语 i18n、桌面样式体系，以及 API 赛事与 shared 包相关调整。

apps/player/src/views/desktop/DesktopAnnouncementsHubShell.vue

@@ -0,0 +1,44 @@
+<script setup lang="ts">
+import { computed } from 'vue';
+import { useRoute } from 'vue-router';
+import { useI18n } from 'vue-i18n';
+import AnnouncementListView from '../AnnouncementListView.vue';
+
+const route = useRoute();
+const { t } = useI18n();
+
+const isDetailRoute = computed(
+  () => route.path.startsWith('/announcements/') && Boolean(route.params.id),
+);
+</script>
+
+<template>
+  <div class="desktop-layout-hub desktop-hub-page">
+    <aside class="desktop-hub-left">
+      <AnnouncementListView embedded />
+    </aside>
+    <main class="desktop-hub-right">
+      <slot v-if="isDetailRoute" />
+      <div v-else class="hub-placeholder">
+        {{ t('announcements.select_hint') }}
+      </div>
+    </main>
+  </div>
+</template>
+
+<style scoped>
+.desktop-hub-page {
+  flex: 1;
+  min-height: 0;
+}
+
+.hub-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 280px;
+  color: var(--text-muted);
+  font-size: 14px;
+  font-weight: 600;
+}
+</style>