feat(group): add node group management UI

Add node group management interface with automatic user assignment and traffic-based grouping.

Features:
- Node group CRUD with traffic range configuration
- Three grouping modes: average, subscription-based, and traffic-based
- Group recalculation with preview and history tracking
- Subscribe-to-group mapping management
- User subscription group locking
- Group calculation history with detailed reports
- Multi-language support (en-US, zh-CN)
- Enhanced node and subscription forms with group selection

apps/admin/public/assets/locales/zh-CN/menu.json

@@ -10,6 +10,7 @@
   "Document Management": "文档管理",
   "Email": "邮件",
   "Gift": "赠送",
+  "Group Management": "分组管理",
   "Login": "登录",
   "Logs & Analytics": "日志与分析",
   "Maintenance": "维护",