[Feature]: 按用户查看用量统计

[QAbot-zh]

Affected area

Frontend / UI

Problem or use case

当前用户可以通过“设置” ➡️ “订阅“ ➡️ ”用量趋势”，来查看自己的用量统计情况，但是管理员好像不能按用户来查看基本的用量统计情况，有具体请求日志，但缺乏一个直观的统计图表

Proposed behavior

允许管理员按用户查看其基本用量统计情况

Alternatives considered

No response

Compatibility, deployment, or migration impact

No response

Documentation or API contract impact

No response

Pre-submit checklist

• I searched existing issues and pull requests.
• This request is focused on one feature or improvement.
• I described user-facing, API, configuration, or deployment impact where relevant.

[qingchunnh]

我觉得干脆做一个仪表盘是最好的，比如可以看到花费、模型token数和调用次数等，支持按单个用户或者全部用户进行统计、可以选择的日期范围等