1.优化后台管理员管理页面的权限设置，新增zihuaadmin账号

web/src/lang/backend/en/auth/admin.ts

@@ -3,6 +3,7 @@ export default {
     nickname: 'Nickname',
     group: 'Group',
     channel: 'Channel',
+    channel_inherit_from_parent: 'Channel is inherited from the selected parent agent and cannot be changed separately.',
     parent_admin: 'Parent agent',
     commission_share_rate: 'Commission share (%)',
     avatar: 'Avatar',
@@ -16,7 +17,7 @@ export default {
     'Personal signature': 'Personal Signature',
     'Administrator login': 'Administrator Login Name',
     'Manage subordinate agents here':
-        'Manage your subordinate agents here. You can only see yourself and your downline, not sub-agents under other agents.',
+        'Manage administrators within your role-group scope (all accounts in your groups and child groups, plus agents in your downline).',
     'Parent admin placeholder': 'Leave empty for top-level channel agent',
     'Top level group parent hint':
         'The selected role group is top-level; no parent agent is required. Settlement uses the channel commission share configured here.',