更新

Docs/BACKEND_DEV.md

@@ -112,10 +112,23 @@ backend/
 - `REDIS_URL`
 - `GLM_API_KEY`
 - `LATENTSYNC_*`
+- `WEIXIN_HEADLESS_MODE` (headful/headless-new)
+- `WEIXIN_CHROME_PATH` / `WEIXIN_BROWSER_CHANNEL`
+- `WEIXIN_USER_AGENT` / `WEIXIN_LOCALE` / `WEIXIN_TIMEZONE_ID`
+- `WEIXIN_FORCE_SWIFTSHADER`
+- `WEIXIN_TRANSCODE_MODE` (reencode/faststart/off)
 
 ---
 
-## 10. 最小新增模块示例
+## 10. Playwright 发布调试
+
+- 诊断日志落盘：`backend/app/debug_screenshots/weixin_network.log` / `douyin_network.log`
+- 关键失败截图：`backend/app/debug_screenshots/weixin_*.png` / `douyin_*.png`
+- 视频号建议使用 headful + xvfb-run（避免 headless 解码/指纹问题）
+
+---
+
+## 11. 最小新增模块示例
 
 ```
 app/modules/foo/