refactor: 完成全站国际化改造，统一多语言支持

此提交完成了全项目的国际化适配：
1. 新增多语言翻译文件与基础配置
2. 替换所有硬编码文本为i18n调用
3. 优化语言切换与文档语言同步逻辑
4. 重构部分业务逻辑以支持动态翻译
5. 移除过时代码与硬编码配置

src/components/token-refresh-indicator.tsx

@@ -2,6 +2,7 @@
 
 import { useState, useEffect } from "react";
 import { RefreshCw, AlertCircle } from "lucide-react";
+import { useTranslation } from "react-i18next";
 
 import { useTokenRefresh } from "@/hooks/use-token-refresh";
 import { Button } from "@/components/ui/button";
@@ -16,6 +17,7 @@ import { cn } from "@/lib/utils";
 export function TokenRefreshIndicator(): React.ReactElement | null {
   const { isTokenExpiringSoon, getTokenRemainingTime, refreshToken } =
     useTokenRefresh();
+  const { t } = useTranslation("player");
   const [isRefreshing, setIsRefreshing] = useState(false);
   const [showWarning, setShowWarning] = useState(false);
   const [remainingSeconds, setRemainingSeconds] = useState<number | null>(null);
@@ -24,7 +26,6 @@ export function TokenRefreshIndicator(): React.ReactElement | null {
   useEffect(() => {
     const checkToken = (): void => {
       const remaining = getTokenRemainingTime();
-      const expiringSoon = isTokenExpiringSoon();
 
       if (remaining > 0 && remaining < 120000) {
         // 2 分钟内显示
@@ -85,16 +86,19 @@ export function TokenRefreshIndicator(): React.ReactElement | null {
             color: isCritical ? ERROR_COLORS.error : ERROR_COLORS.warning,
           }}
         >
-          {isCritical ? "登录即将失效" : "登录即将过期"}
+          {isCritical ? t("token.critical") : t("token.warning")}
         </span>
         <span className="text-xs text-muted-foreground">
           {remainingSeconds !== null && (
             <>
-              剩余 {Math.floor(remainingSeconds / 60)}:
-              {String(remainingSeconds % 60).padStart(2, "0")} {" "}
+              {t("token.remaining", {
+                time: `${Math.floor(remainingSeconds / 60)}:${String(
+                  remainingSeconds % 60,
+                ).padStart(2, "0")}`,
+              })}{" "}
             </>
           )}
-          正在自动续签...
+          {t("token.autoRenewing")}
         </span>
       </div>
 
@@ -112,7 +116,7 @@ export function TokenRefreshIndicator(): React.ReactElement | null {
         <RefreshCw
           className={cn("size-3.5", isRefreshing && "animate-spin")}
         />
-        立即续签
+        {t("token.renewNow")}
       </Button>
     </div>
   );