feat: 增强国际化支持与安全头配置

- 在 .env.example 中新增 i18next 相关配置项以支持多语言功能
- 在 next.config.ts 中添加安全头配置以支持 iframe 嵌入
- 更新 Providers 组件以引入 i18n 配置
- 在 PlayerAppShell 中集成 LanguageSwitcher 组件以实现语言切换功能
- 优化 HallWalletStrip 组件的网络状态管理逻辑
- 更新多个组件以支持国际化文本

src/i18n/index.ts

@@ -0,0 +1,85 @@
+import i18n from "i18next";
+import LanguageDetector from "i18next-browser-languagedetector";
+import { initReactI18next } from "react-i18next";
+
+import enCommon from "./locales/en/common.json";
+import enEntry from "./locales/en/entry.json";
+import enLayout from "./locales/en/layout.json";
+import neCommon from "./locales/ne/common.json";
+import neEntry from "./locales/ne/entry.json";
+import neLayout from "./locales/ne/layout.json";
+import zhCommon from "./locales/zh/common.json";
+import zhEntry from "./locales/zh/entry.json";
+import zhLayout from "./locales/zh/layout.json";
+
+/** 对齐后端与产品：尼泊尔语 / 英语 / 中文（简体） */
+export const SUPPORTED_LANGUAGES = [
+  { code: "en" as const, flag: "🇺🇸" },
+  { code: "ne" as const, flag: "🇳🇵" },
+  { code: "zh" as const, flag: "🇨🇳" },
+];
+
+export type AppLanguage = (typeof SUPPORTED_LANGUAGES)[number]["code"];
+
+export const DEFAULT_LANGUAGE: AppLanguage = "en";
+
+const namespaces = ["common", "entry", "layout"] as const;
+
+const resources = {
+  en: {
+    common: enCommon,
+    entry: enEntry,
+    layout: enLayout,
+  },
+  ne: {
+    common: neCommon,
+    entry: neEntry,
+    layout: neLayout,
+  },
+  zh: {
+    common: zhCommon,
+    entry: zhEntry,
+    layout: zhLayout,
+  },
+} satisfies Record<
+  AppLanguage,
+  Record<(typeof namespaces)[number], Record<string, unknown>>
+>;
+
+export function normalizeLanguage(lang: string | undefined): AppLanguage {
+  const base = lang?.split("-")[0]?.toLowerCase();
+  if (base === "ne") return "ne";
+  if (base === "zh") return "zh";
+  return "en";
+}
+
+if (!i18n.isInitialized) {
+  void i18n
+    .use(LanguageDetector)
+    .use(initReactI18next)
+    .init({
+      resources,
+      fallbackLng: DEFAULT_LANGUAGE,
+      supportedLngs: ["en", "ne", "zh"],
+      defaultNS: "common",
+      ns: [...namespaces],
+      /** zh-CN → zh，ne-NP → ne，未匹配时用 fallbackLng */
+      load: "languageOnly",
+
+      detection: {
+        order: ["localStorage", "navigator"],
+        caches: ["localStorage"],
+        lookupLocalStorage: "i18nextLng",
+      },
+
+      interpolation: {
+        escapeValue: false,
+      },
+
+      react: {
+        useSuspense: false,
+      },
+    });
+}
+
+export default i18n;