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/src/layout/navs.ts

@@ -34,6 +34,11 @@ export function useNavs() {
             url: "/dashboard/nodes",
             icon: "flat-color-icons:mind-map",
           },
+          {
+            title: t("Group Management", "Group Management"),
+            url: "/dashboard/group",
+            icon: "flat-color-icons:department",
+          },
           {
             title: t("Subscribe Config", "Subscribe Config"),
             url: "/dashboard/subscribe",