feat: WC2026 赛事 seed、生产上线初始化脚本与目录归档

重构 seed 为 WC2026 72 场小组赛与 48 强优胜盘；新增 production 模式仅保留 admin 与赛事示例；提供 prod-init-db 全量重置脚本；管理端 i18n 分包与赛事归档能力。

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

apps/admin/src/i18n/locale-loader.ts

@@ -0,0 +1,32 @@
+import type { AdminLocale } from './admin-messages';
+import { adminMessages } from './admin-messages';
+
+const loaders: Record<AdminLocale, () => Promise<{ default: Record<string, string> }>> = {
+  'zh-CN': () => import('./bundles/zh-CN'),
+  'en-US': () => import('./bundles/en-US'),
+  'ms-MY': () => import('./bundles/ms-MY'),
+};
+
+const inflight = new Map<AdminLocale, Promise<void>>();
+
+/** 按语言动态加载文案包（仅当前 locale 进入主路径，其余为独立 chunk）。 */
+export async function ensureAdminLocaleLoaded(locale: AdminLocale): Promise<void> {
+  if (Object.keys(adminMessages[locale]).length > 0) return;
+  const pending = inflight.get(locale);
+  if (pending) return pending;
+
+  const task = loaders[locale]().then((mod) => {
+    adminMessages[locale] = mod.default;
+  });
+  inflight.set(locale, task);
+  try {
+    await task;
+  } finally {
+    inflight.delete(locale);
+  }
+}
+
+/** 切换语言时预加载目标 locale（与 ensureAdminLocaleLoaded 相同，供 setLocale 调用）。 */
+export async function preloadAdminLocale(locale: AdminLocale): Promise<void> {
+  await ensureAdminLocaleLoaded(locale);
+}