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。

landingpage/app/page.tsx

@@ -0,0 +1,35 @@
+'use client';
+
+if (typeof window !== 'undefined') {
+  history.scrollRestoration = 'manual';
+}
+
+import Navbar from '@/components/Navbar';
+import HeroSection from '@/components/HeroSection';
+import StatsSection from '@/components/StatsSection';
+import TrustedBySection from '@/components/TrustedBySection';
+import WhyAssetXSection from '@/components/WhyAssetXSection';
+import HowItWorksSection from '@/components/HowItWorksSection';
+import SecuritySection from '@/components/SecuritySection';
+import Footer from '@/components/Footer';
+import { useTheme } from '@/contexts/ThemeContext';
+
+export default function Home() {
+  const { theme } = useTheme();
+  const isDark = theme === 'dark';
+
+  return (
+    <div className={`min-h-screen overflow-x-hidden ${isDark ? 'bg-[#0a0a0a]' : 'bg-white'}`}>
+      <Navbar />
+      <main style={{ paddingTop: 'var(--navbar-height, 72px)' }}>
+        <HeroSection />
+        <StatsSection />
+      </main>
+      <TrustedBySection />
+      <WhyAssetXSection />
+      <HowItWorksSection />
+      <SecuritySection />
+      <Footer />
+    </div>
+  );
+}