Show usage per API key

Summary

Allow users to see the usage of individual API keys in addition to the overall usage. This allows users to see which apps, services, agents are using or bleeding tokens.

Expected Behavior

When clicking the Usage tab on the Command Code website, there should be an option to cycle through a list of currently issued API keys, and display the usage for those keys only. OpenCode Go has a good implementation of this feature.

Actual Behavior

Only overall usage is displayed. This means someone who issued multiple API keys can not see which keys are using the most tokens. I can see I used 6 Kimi K2.7 calls yes, but from which of my agents??

Steps to reproduce the issue

Sign into Command Code
Click on Usage

Command Code Version

1.26.0

Operating System

Other

Terminal/IDE

ghostty

Shell

bash

Session file (optional)

No response

Fix prompt (optional)

No response

Additional context

This is a feature on the website, user dashboard. Not in the harness.

从 Command Code 网站的 Usage 标签页开始，跟踪整体使用量的加载和呈现方式；使用所引用的 OpenCode Go 实现进行对比。完成的标准是，用户可以在其已签发的 API 密钥之间切换，并查看所选密钥的使用量，同时整体使用量仍然可用。