feat: add landing page

landing/vite.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig, loadEnv } from 'vite';
+import react from '@vitejs/plugin-react';
+
+function normalizeBasePath(value: string | undefined) {
+  const raw = value?.trim();
+  if (!raw || raw === '/') return '/';
+  if (raw === './') return './';
+  if (/^https?:\/\//.test(raw)) {
+    return raw.endsWith('/') ? raw : `${raw}/`;
+  }
+  return `/${raw.replace(/^\/+|\/+$/g, '')}/`;
+}
+
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), '');
+
+  return {
+    base: normalizeBasePath(env.VITE_BASE_PATH),
+    plugins: [react()],
+  };
+});