sync(theme-4): 同步 main 最新 API/Admin 与玩家端逻辑

从 main 同步站内信手动发送、媒体库选择、列表子路由重构等 API/Admin 改动；玩家端仅合并 ADMIN_CUSTOM 富文本、消息预览与充值截图压缩逻辑，保留 theme-4 样式。

apps/admin/src/views/matches/LeagueOutrightsPage.vue

@@ -0,0 +1,53 @@
+<script setup lang="ts">
+import { computed } from 'vue';
+import { useRoute } from 'vue-router';
+import { useAdminLocale } from '../../composables/useAdminLocale';
+import AdminSubNav from '../../components/AdminSubNav.vue';
+import LeagueOutrightOddsPanel from './LeagueOutrightOddsPanel.vue';
+
+defineOptions({ name: 'AdminLeagueOutrights' });
+
+const route = useRoute();
+const { t } = useAdminLocale();
+
+const leagueId = computed(() => String(route.params.leagueId ?? ''));
+const leagueTitle = computed(() => {
+  const title = String(route.query.title ?? '').trim();
+  return title || `#${leagueId.value}`;
+});
+</script>
+
+<template>
+  <div class="admin-list-page league-outrights-page">
+    <AdminSubNav
+      :title="leagueTitle"
+      :subtitle="t('match.league_outrights_subtitle')"
+    />
+
+    <section class="list-panel">
+      <LeagueOutrightOddsPanel :league-id="leagueId" />
+    </section>
+  </div>
+</template>
+
+<style scoped>
+.league-outrights-page {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  min-height: 0;
+}
+
+.league-outrights-page :deep(.admin-subnav) {
+  margin-bottom: 10px;
+}
+
+.league-outrights-page .list-panel {
+  flex: 1;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  padding: 0;
+}
+</style>