[WIP] Fix user creation feedback message issue

[Copilot]

Analysis Complete - Identified Issues

Based on the problem statement in Chinese:

1. 用户创建没有成功 显示更新成功 (User creation fails but displays "update successful")
2. 角色上没有配置数据源的字段 (Role configuration page doesn't show data source field)

Root Causes Found:

Issue 1 - User Creation Message Bug:

• In User.cs line 17, the Id property has a default value: = Guid.NewGuid().ToString()
• When creating a new User object in UserList.razor, the Id is automatically populated with a GUID
• The create/update check on line 185 uses if (string.IsNullOrWhiteSpace(_editingUser.Id))
• This check always evaluates to false because Id is never null/empty, causing create operations to execute the update code path
• Result: User creation shows "更新用户成功" instead of "创建用户成功"

Issue 2 - Role Data Sources Not Displayed:

• The RoleList.razor page doesn't display which data sources are assigned to each role in the table
• Users cannot see which data sources are configured for a role without clicking "分配数据源"

Fix Plan:

• Fix Issue 1: Modify UserList.razor to use a different create/update detection method
• Fix Issue 2: Add a data sources column to the role list table to display assigned data sources
• Test the fixes by building the project
• Run code review before finalizing

Original prompt

1、用户创建没有成功 显示更新成功 2、角色上没有配置数据源的字段

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[xuzeyu91]

@copilot 角色新建 和用户新建 都没成功保存