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/translation.json

@@ -7,6 +7,10 @@
     "serverRequired": "Please select a server"
   },
   "form": {
+    "quantityRequired": "Quantity is required",
+    "subscribePlanRequired": "Subscribe plan is required",
+    "totalCountRequired": "Total count is required",
+    "unitTimeRequired": "Unit time is required",
     "validation": {
       "nameRequired": "Client name is required",
       "userAgentRequiredSuffix": "is required"