debug: add logging to previewProxy middleware

platform/server/dist/middleware/previewProxy.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"previewProxy.d.ts","sourceRoot":"","sources":["../../src/middleware/previewProxy.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,OAAO,EAAE,QAAQ,EAAE,MAAM,SAAS,CAAC;AAmB5C;;;;GAIG;AACH,wBAAgB,YAAY,CAAC,GAAG,EAAE,OAAO,EAAE,GAAG,EAAE,QAAQ,GAAG,IAAI,CA6E9D"}
+{"version":3,"file":"previewProxy.d.ts","sourceRoot":"","sources":["../../src/middleware/previewProxy.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,OAAO,EAAE,QAAQ,EAAE,MAAM,SAAS,CAAC;AAmB5C;;;;GAIG;AACH,wBAAgB,YAAY,CAAC,GAAG,EAAE,OAAO,EAAE,GAAG,EAAE,QAAQ,GAAG,IAAI,CA8E9D"}

platform/server/dist/middleware/previewProxy.js

@@ -27,6 +27,7 @@ const HOP_BY_HOP = new Set([
 function previewProxy(req, res) {
     // Express mount 会剥离 /preview 前缀，req.url 即 Vite 需要的路径
     const targetPath = req.url || "/";
+    console.log(`[preview:proxy] ${req.method} ${targetPath}`);
     // 过滤请求 headers（去掉 hop-by-hop，设置正确的 host）
     const reqHeaders = {};
     for (const [key, value] of Object.entries(req.headers)) {

platform/server/src/middleware/previewProxy.ts

@@ -25,6 +25,7 @@ const HOP_BY_HOP = new Set([
 export function previewProxy(req: Request, res: Response): void {
   // Express mount 会剥离 /preview 前缀，req.url 即 Vite 需要的路径
   const targetPath = req.url || "/";
+  console.log(`[preview:proxy] ${req.method} ${targetPath}`);
 
   // 过滤请求 headers（去掉 hop-by-hop，设置正确的 host）
   const reqHeaders: Record<string, string> = {};