feat: 世界杯48强夺冠盘、管理端调赔与项目文档

- 固定48强基准数据、同步种子与后台世界杯夺冠页

- 补全 user_preferences 迁移文件；新增启动指南与默认数据说明

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/admin/src/layouts/ManageLayout.vue

@@ -15,6 +15,7 @@ const adminMenus = computed(() => [
   { path: '/users', label: t('nav.users') },
   { path: '/agents', label: t('nav.agents') },
   { path: '/matches', label: t('nav.matches') },
+  { path: '/world-cup-outright', label: t('nav.outright') },
   { path: '/bets', label: t('nav.bets') },
   { path: '/cashback', label: t('nav.cashback') },
   { path: '/audit', label: t('nav.audit') },