fix: remove deprecated experimental.appDir and fix Makefile export target indentation

ui/homepage/Makefile

@@ -23,8 +23,8 @@ build:
 	yarn next build
 
 export:
-        @echo "📦 Exporting homepage static site to ./out ..."
-        yarn next build
+	@echo "📦 Exporting homepage static site to ./out ..."
+	yarn next build
 
 clean:
 	@echo "🧹 Cleaning .next and out directories..."
@@ -32,3 +32,4 @@ clean:
 
 info:
 	@echo "🧾 Node.js version: $(NODE_VERSION)"
+

ui/homepage/next.config.js

@@ -1,11 +1,11 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-  output: 'export', // ✅ 开启静态导出支持
+  output: 'export', // 开启静态导出
   reactStrictMode: true,
-  experimental: {
-    appDir: true // ✅ 启用 App Router 模式
-  }
+  // 移除 experimental.appDir
+  // experimental: {
+  //   appDir: true
+  // }
 }
 
 module.exports = nextConfig
-