docs: standardize skill-template and add development guide

scripts/service/platform_playwright.py

@@ -0,0 +1,10 @@
+"""后台自动化占位模块模板。"""
+
+from __future__ import annotations
+
+from typing import Any, Dict
+
+
+async def publish(account: Dict[str, Any], article: Dict[str, Any], account_id: str) -> str:
+    _ = (account, article, account_id)
+    return "ERROR:NOT_IMPLEMENTED 请复制模板后将本文件改名为具体平台模块并实现后台自动化逻辑"