feat(admin, i18n): enhance admin dashboard and user management with new features and translations

Added the ability to filter admin dashboard data by site code and agent node ID, improving data retrieval capabilities. Introduced new functions for fetching dashboard data based on these parameters. Updated the admin users and roles management components to reflect these changes. Enhanced multi-language support by adding new translations for agent management and permission levels in English, Nepali, and Chinese, ensuring a consistent user experience across the admin interface.

src/i18n/locales/zh/agents.json

@@ -20,11 +20,12 @@
   "deleteSuccess": "已删除代理 {{name}}",
   "saveFailed": "保存失败",
   "codeRequired": "请填写编码与名称",
+  "modelGuide": "代理层负责数据范围（Scope）与授权上限（Ceiling），账号权限请通过角色分配。",
   "tabs": {
     "overview": "概况",
     "roles": "角色",
     "users": "账号",
-    "delegation": "下放权限"
+    "delegation": "授权上限"
   },
   "delegation": {
     "title": "下放权限上限",
@@ -47,7 +48,11 @@
     "deleteSuccess": "已删除角色 {{name}}",
     "permissionSaveSuccess": "权限已更新",
     "readOnlyTemplate": "只读模板",
-    "permissionSubsetHint": "只能分配您当前拥有的权限"
+    "permissionSubsetHint": "只能分配您当前拥有的权限",
+    "selectedCount": "已选 {{selected}} / {{total}} 项",
+    "groupSelectedCount": "已选 {{selected}} / {{total}}",
+    "selectGroup": "本组全选",
+    "noAssignablePermissions": "当前没有可分配权限"
   },
   "users": {
     "title": "代理账号",