init: 初始化 AssetX 项目仓库

包含 webapp（Next.js 用户端）、webapp-back（Go 后端）、
antdesign（管理后台）、landingpage（营销落地页）、
数据库 SQL 和配置文件。

webapp/components/layout/TopBar.tsx

@@ -0,0 +1,34 @@
+"use client";
+
+import Breadcrumb from "./Breadcrumb";
+import LanguageSwitch from "./LanguageSwitch";
+import WalletButton from "@/components/wallet/WalletButton";
+
+interface BreadcrumbItem {
+  label: string;
+  href?: string;
+}
+
+interface TopBarProps {
+  breadcrumbItems?: BreadcrumbItem[];
+}
+
+export default function TopBar({ breadcrumbItems }: TopBarProps) {
+  return (
+    <div className="hidden md:flex items-center justify-between w-full">
+      {/* Left: Breadcrumb */}
+      <div className="flex items-center gap-2">
+        {breadcrumbItems && <Breadcrumb items={breadcrumbItems} />}
+      </div>
+
+      {/* Right: Actions */}
+      <div className="flex items-center gap-4 pr-4">
+        {/* Language Switch */}
+        <LanguageSwitch />
+
+        {/* Wallet Button */}
+        <WalletButton />
+      </div>
+    </div>
+  );
+}