feat: implement i18n lazy loading optimization

🚀 Performance improvements:
- Replace static language imports with dynamic imports
- Load only current language on startup instead of all 13 languages
- Implement on-demand loading when switching languages

📦 Bundle optimization:
- Reduce initial bundle size by avoiding preloading all language files
- Add resource caching to prevent reloading same language
- Support all 13 languages: en, ru, zh, fa, tt, id, ar, ko, tr, de, es, jp, zhtw

🔧 Technical changes:
- Convert i18n.ts to use dynamic import() for language resources
- Add async initializeLanguage() for app startup
- Create useI18n hook for language management with loading states
- Update main.tsx for async language initialization
- Fix language display labels in settings dropdown
- Maintain backward compatibility with existing language system

✅ Fixed issues:
- Resolve infinite loop in React components
- Fix missing language labels in settings UI
- Prevent circular dependencies in language loading
- Add proper error handling and fallback mechanisms

src/components/setting/setting-verge-basic.tsx

@@ -19,7 +19,7 @@ import getSystem from "@/utils/get-system";
 import { routers } from "@/pages/_routers";
 import { TooltipIcon } from "@/components/base/base-tooltip-icon";
 import { ContentCopyRounded } from "@mui/icons-material";
-import { languages } from "@/services/i18n";
+import { supportedLanguages } from "@/services/i18n";
 import { showNotice } from "@/services/noticeService";
 
 interface Props {
@@ -28,7 +28,7 @@ interface Props {
 
 const OS = getSystem();
 
-const languageOptions = Object.entries(languages).map(([code, _]) => {
+const languageOptions = supportedLanguages.map((code) => {
   const labels: { [key: string]: string } = {
     en: "English",
     ru: "Русский",
@@ -39,8 +39,13 @@ const languageOptions = Object.entries(languages).map(([code, _]) => {
     ar: "العربية",
     ko: "한국어",
     tr: "Türkçe",
+    de: "Deutsch",
+    es: "Español",
+    jp: "日本語",
+    zhtw: "繁體中文",
   };
-  return { code, label: labels[code] };
+  const label = labels[code] || code;
+  return { code, label };
 });
 
 const SettingVergeBasic = ({ onError }: Props) => {

src/hooks/use-i18n.ts

@@ -0,0 +1,45 @@
+import { useState, useCallback } from "react";
+import { useTranslation } from "react-i18next";
+import { changeLanguage, supportedLanguages } from "@/services/i18n";
+import { useVerge } from "./use-verge";
+
+export const useI18n = () => {
+  const { i18n, t } = useTranslation();
+  const { patchVerge } = useVerge();
+  const [isLoading, setIsLoading] = useState(false);
+
+  const switchLanguage = useCallback(
+    async (language: string) => {
+      if (!supportedLanguages.includes(language)) {
+        console.warn(`Unsupported language: ${language}`);
+        return;
+      }
+
+      if (i18n.language === language) {
+        return;
+      }
+
+      setIsLoading(true);
+      try {
+        await changeLanguage(language);
+
+        if (patchVerge) {
+          await patchVerge({ language });
+        }
+      } catch (error) {
+        console.error("Failed to change language:", error);
+      } finally {
+        setIsLoading(false);
+      }
+    },
+    [i18n.language, patchVerge],
+  );
+
+  return {
+    currentLanguage: i18n.language,
+    supportedLanguages,
+    switchLanguage,
+    isLoading,
+    t,
+  };
+};

src/main.tsx

@@ -13,7 +13,7 @@ import { ComposeContextProvider } from "foxact/compose-context-provider";
 import { BrowserRouter } from "react-router-dom";
 import { BaseErrorBoundary } from "./components/base";
 import Layout from "./pages/_layout";
-import "./services/i18n";
+import { initializeLanguage } from "./services/i18n";
 import {
   LoadingCacheProvider,
   ThemeModeProvider,
@@ -39,29 +39,47 @@ document.addEventListener("keydown", (event) => {
       ["F", "G", "H", "J", "P", "Q", "R", "U"].includes(
         event.key.toUpperCase(),
       ));
-  disabledShortcuts && event.preventDefault();
+  if (disabledShortcuts) {
+    event.preventDefault();
+  }
 });
 
-const contexts = [
-  <ThemeModeProvider />,
-  <LoadingCacheProvider />,
-  <UpdateStateProvider />,
-];
+const initializeApp = async () => {
+  try {
+    await initializeLanguage("zh");
 
-const root = createRoot(container);
-root.render(
-  <React.StrictMode>
-    <ComposeContextProvider contexts={contexts}>
-      <BaseErrorBoundary>
-        <AppDataProvider>
-          <BrowserRouter>
-            <Layout />
-          </BrowserRouter>
-        </AppDataProvider>
-      </BaseErrorBoundary>
-    </ComposeContextProvider>
-  </React.StrictMode>,
-);
+    const contexts = [
+      <ThemeModeProvider key="theme" />,
+      <LoadingCacheProvider key="loading" />,
+      <UpdateStateProvider key="update" />,
+    ];
+
+    const root = createRoot(container);
+    root.render(
+      <React.StrictMode>
+        <ComposeContextProvider contexts={contexts}>
+          <BaseErrorBoundary>
+            <AppDataProvider>
+              <BrowserRouter>
+                <Layout />
+              </BrowserRouter>
+            </AppDataProvider>
+          </BaseErrorBoundary>
+        </ComposeContextProvider>
+      </React.StrictMode>,
+    );
+  } catch (error) {
+    console.error("[main.tsx] 应用初始化失败:", error);
+    const root = createRoot(container);
+    root.render(
+      <div style={{ padding: "20px", color: "red" }}>
+        应用初始化失败: {error instanceof Error ? error.message : String(error)}
+      </div>,
+    );
+  }
+};
+
+initializeApp();
 
 // 错误处理
 window.addEventListener("error", (event) => {

src/pages/_layout.tsx

@@ -1,5 +1,4 @@
 import dayjs from "dayjs";
-import i18next from "i18next";
 import relativeTime from "dayjs/plugin/relativeTime";
 import { SWRConfig, mutate } from "swr";
 import { useEffect, useCallback, useState, useRef } from "react";
@@ -11,6 +10,7 @@ import { routers } from "./_routers";
 import { getAxios } from "@/services/api";
 import { forceRefreshClashConfig } from "@/services/cmds";
 import { useVerge } from "@/hooks/use-verge";
+import { useI18n } from "@/hooks/use-i18n";
 import LogoSvg from "@/assets/image/logo.svg?react";
 import iconLight from "@/assets/image/icon_light.svg?react";
 import iconDark from "@/assets/image/icon_dark.svg?react";
@@ -158,6 +158,7 @@ const Layout = () => {
   const [enableLog] = useEnableLog();
   const [logLevel] = useLocalStorage<LogLevel>("log:log-level", "info");
   const { language, start_page } = verge ?? {};
+  const { switchLanguage } = useI18n();
   const navigate = useNavigate();
   const location = useLocation();
   const routersEles = useRoutes(routers);
@@ -439,9 +440,9 @@ const Layout = () => {
   useEffect(() => {
     if (language) {
       dayjs.locale(language === "zh" ? "zh-cn" : language);
-      i18next.changeLanguage(language);
+      switchLanguage(language);
     }
-  }, [language]);
+  }, [language, switchLanguage]);
 
   useEffect(() => {
     if (start_page) {

src/services/i18n.ts

@@ -1,29 +1,59 @@
 import i18n from "i18next";
 import { initReactI18next } from "react-i18next";
-import en from "@/locales/en.json";
-import ru from "@/locales/ru.json";
-import zh from "@/locales/zh.json";
-import fa from "@/locales/fa.json";
-import tt from "@/locales/tt.json";
-import id from "@/locales/id.json";
-import ar from "@/locales/ar.json";
-import ko from "@/locales/ko.json";
-import tr from "@/locales/tr.json";
 
-export const languages = { en, ru, zh, fa, tt, id, ar, ko, tr };
+export const supportedLanguages = [
+  "en",
+  "ru",
+  "zh",
+  "fa",
+  "tt",
+  "id",
+  "ar",
+  "ko",
+  "tr",
+  "de",
+  "es",
+  "jp",
+  "zhtw",
+];
 
-const resources = Object.fromEntries(
-  Object.entries(languages).map(([key, value]) => [
-    key,
-    { translation: value },
-  ]),
+export const languages: Record<string, any> = supportedLanguages.reduce(
+  (acc, lang) => {
+    acc[lang] = {};
+    return acc;
+  },
+  {} as Record<string, any>,
 );
 
+export const loadLanguage = async (language: string) => {
+  try {
+    const module = await import(`@/locales/${language}.json`);
+    return module.default;
+  } catch (error) {
+    console.warn(`Failed to load language ${language}, fallback to zh`);
+    const fallback = await import("@/locales/zh.json");
+    return fallback.default;
+  }
+};
+
 i18n.use(initReactI18next).init({
-  resources,
+  resources: {},
   lng: "zh",
   fallbackLng: "zh",
   interpolation: {
     escapeValue: false,
   },
 });
+
+export const changeLanguage = async (language: string) => {
+  if (!i18n.hasResourceBundle(language, "translation")) {
+    const resources = await loadLanguage(language);
+    i18n.addResourceBundle(language, "translation", resources);
+  }
+
+  await i18n.changeLanguage(language);
+};
+
+export const initializeLanguage = async (initialLanguage: string = "zh") => {
+  await changeLanguage(initialLanguage);
+};