重构图片加载逻辑，更新为本地-远程-占位图+异步下载。优先显示本地图片，没有就显示原始远程图片，还没有就使用占位图。后台自动异步下载原始图

app/[...slug]/page.jsx

@@ -87,7 +87,8 @@ export default async function DynamicPage({ params, searchParams }) {
     slug_list: slugArr,
     page: 1,
     page_size: pageSize,
-    downloadFiles: true // Download files for page rendering
+    downloadFiles: false,
+    rewriteToProxy: true
   });
 
   if (error) {

app/blog/[...slug]/page.jsx

@@ -75,7 +75,8 @@ export default async function Page({ params, searchParams }) {
     slug_list: slugArr,
     page: 1,
     page_size: pageSize,
-    downloadFiles: true,
+    downloadFiles: false,
+    rewriteToProxy: true,
   });
 
   if (error) {

app/contact/page.jsx

@@ -50,7 +50,8 @@ export default async function Page() {
   // 获取页面数据
   const { data, error } = await getPageData({
     slug_list: slugArr,
-    downloadFiles: true // Download files for page rendering
+    downloadFiles: false,
+    rewriteToProxy: true
   });
 
   if (error) {

app/files/[...path]/route.js

@@ -47,7 +47,9 @@ export async function GET(req, { params }) {
     const remoteUrl = `${BACKEND_SERVER_URL}/files/${fileName}`;
     const res = await fetch(remoteUrl);
     if (!res.ok) {
-      return new NextResponse('Not Found', { status: 404, headers: { 'Cache-Control': 'no-store' } });
+    // 占位图（SVG），避免前端空白
+    const placeholder = `<svg xmlns="http://www.w3.org/2000/svg" width="800" height="450" viewBox="0 0 800 450"><rect width="800" height="450" fill="#f3f4f6"/><text x="50%" y="50%" dominant-baseline="middle" text-anchor="middle" fill="#9ca3af" font-size="20" font-family="Arial, Helvetica, sans-serif">Image unavailable</text></svg>`;
+    return new NextResponse(placeholder, { status: 200, headers: { 'Content-Type': 'image/svg+xml', 'Cache-Control': 'no-store' } });
     }
     const arrayBuffer = await res.arrayBuffer();
     const buffer = Buffer.from(arrayBuffer);

app/products/[...slug]/page.jsx

@@ -75,7 +75,8 @@ export default async function Page({ params, searchParams }) {
     slug_list: slugArr,
     page: 1,
     page_size: pageSize,
-    downloadFiles: true,
+    downloadFiles: false,
+    rewriteToProxy: true,
   });
 
   if (error) {

components/common/DynamicListPage/index.jsx

@@ -16,7 +16,8 @@ export default async function DynamicListPage({ slugArr, basePath, columns, page
       slug_list: slugArr,
       page: currentPage,
       page_size: pageSize,
-      downloadFiles: true
+      downloadFiles: false,
+      rewriteToProxy: true
     });
     items = result.data;
     total = result.total;