refactor: 更新管理端页面元数据，统一国际化支持，移除冗余代码

src/lib/page-metadata.ts

@@ -0,0 +1,57 @@
+import type { Metadata } from "next";
+
+import enAdminRoles from "@/i18n/locales/en/adminRoles.json";
+import enAdminUsers from "@/i18n/locales/en/adminUsers.json";
+import enAudit from "@/i18n/locales/en/audit.json";
+import enAuth from "@/i18n/locales/en/auth.json";
+import enConfig from "@/i18n/locales/en/config.json";
+import enDashboard from "@/i18n/locales/en/dashboard.json";
+import enDraws from "@/i18n/locales/en/draws.json";
+import enJackpot from "@/i18n/locales/en/jackpot.json";
+import enPlayers from "@/i18n/locales/en/players.json";
+import enReconcile from "@/i18n/locales/en/reconcile.json";
+import enRisk from "@/i18n/locales/en/risk.json";
+import enSettlement from "@/i18n/locales/en/settlement.json";
+import enCommon from "@/i18n/locales/en/common.json";
+import enTickets from "@/i18n/locales/en/tickets.json";
+import enWallet from "@/i18n/locales/en/wallet.json";
+
+const EN_FLAT: Record<string, Record<string, unknown>> = {
+  dashboard: enDashboard,
+  players: enPlayers,
+  draws: enDraws,
+  tickets: enTickets,
+  settlement: enSettlement,
+  reconcile: enReconcile,
+  audit: enAudit,
+  adminUsers: enAdminUsers,
+  adminRoles: enAdminRoles,
+  wallet: enWallet,
+  risk: enRisk,
+  jackpot: enJackpot,
+  config: enConfig,
+  common: enCommon,
+  auth: enAuth,
+};
+
+function getByPath(obj: Record<string, unknown>, path: string): string | undefined {
+  const parts = path.split(".");
+  let cur: unknown = obj;
+  for (const part of parts) {
+    if (cur == null || typeof cur !== "object") {
+      return undefined;
+    }
+    cur = (cur as Record<string, unknown>)[part];
+  }
+  return typeof cur === "string" ? cur : undefined;
+}
+
+/** SSR 默认英文标题；客户端由 {@link AdminDocumentTitle} 按用户语言覆盖。 */
+export function buildPageMetadata(ns: string, key: string): Metadata {
+  const bundle = EN_FLAT[ns];
+  const title = bundle ? getByPath(bundle as Record<string, unknown>, key) : undefined;
+
+  return {
+    title: title ?? key,
+  };
+}