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>

ethend/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "cyrene-ethend",
+  "version": "1.0.0",
+  "description": "Cyrene AI 高级管理控制台 - 服务管理、日志监控、性能分析",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "node --watch src/index.js"
+  },
+  "dependencies": {
+    "express": "^4.21.0",
+    "ws": "^8.18.1",
+    "pidusage": "^4.0.0",
+    "chokidar": "^4.0.3"
+  }
+}