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/en-US/system.json

@@ -19,6 +19,7 @@
     "description": "Configure currency units, symbols, and exchange rate API settings",
     "title": "Currency Configuration"
   },
+  "groupSettings": "Group Settings",
   "invite": {
     "description": "Configure user invitation and referral reward settings",
     "forcedInvite": "Require Invitation to Register",