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/layout/player-bottom-nav.tsx

@@ -4,26 +4,27 @@ import Link from "next/link";
 import { usePathname } from "next/navigation";
 
 import { BarChart3, ClipboardList, Home, Wallet } from "lucide-react";
+import { useTranslation } from "react-i18next";
 
 import { cn } from "@/lib/utils";
 
 const tabs = [
-  { href: "/hall", label: "Home", icon: Home, match: (p: string) => p === "/hall" },
+  { href: "/hall", labelKey: "nav.home", icon: Home, match: (p: string) => p === "/hall" },
   {
     href: "/results",
-    label: "Results",
+    labelKey: "nav.results",
     icon: BarChart3,
     match: (p: string) => p === "/results" || p.startsWith("/results/"),
   },
   {
     href: "/orders",
-    label: "My Bets",
+    labelKey: "nav.orders",
     icon: ClipboardList,
     match: (p: string) => p === "/orders" || p.startsWith("/orders/"),
   },
   {
     href: "/wallet",
-    label: "Wallet",
+    labelKey: "nav.wallet",
     icon: Wallet,
     match: (p: string) => p === "/wallet" || p.startsWith("/wallet/"),
   },
@@ -34,15 +35,17 @@ const tabs = [
  */
 export function PlayerBottomNav() {
   const pathname = usePathname() ?? "";
+  const { t } = useTranslation("player");
 
   return (
     <nav
       className="fixed bottom-0 left-0 right-0 z-50 border-t border-[#e4ebf5] bg-white/96 pb-[env(safe-area-inset-bottom,0px)] shadow-[0_-10px_30px_rgba(15,23,42,0.08)] backdrop-blur-md"
-      aria-label="主导航"
+      aria-label={t("nav.aria")}
     >
       <div className="mx-auto grid h-16 w-full max-w-lg grid-rows-1 [grid-template-columns:repeat(4,minmax(0,1fr))]">
-        {tabs.map(({ href, label, icon: Icon, match }) => {
+        {tabs.map(({ href, labelKey, icon: Icon, match }) => {
           const active = match(pathname);
+          const label = t(labelKey);
           return (
             <Link
               key={href}