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.

從 Command Code 網站的 Usage 分頁開始，追蹤整體用量如何載入及呈現；使用所參照的 OpenCode Go 實作進行比較。完成的標準是，使用者可以在其已簽發的 API 金鑰之間切換，並查看所選金鑰的用量，同時整體用量仍然可用。