refactor: DevTools → ethend 重命名 + 加入生产环境

- 目录 devtools/ → ethend/
- CLI 脚本 devtools.sh/.bat → ethend.sh/.bat
- 环境变量 DEVTOOLS_PORT → ETHEND_PORT
- docker-compose.yml 新增 ethend 服务（生产部署）
- 同步更新全部文档、注释和配置文件

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

debug/cache/test_cdp_frontend.py

@@ -4,7 +4,7 @@ import json, time, base64, os
 from websocket import create_connection
 
 PAGE_URL = "http://localhost:5199/"
-CDP_WS = "ws://127.0.0.1:9225/devtools/browser/b2fca0da-35d6-4180-8413-eddf53753c6a"
+CDP_WS = "ws://127.0.0.1:9225/ethend/browser/b2fca0da-35d6-4180-8413-eddf53753c6a"
 
 def send_cmd(ws, method, params=None, msg_id=1):
     payload = json.dumps({"id": msg_id, "method": method, "params": params or {}})