Expand /usage to monthly stats

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#513 建立於 2025年11月9日 0 則留言 0 個 reaction 已指派 0 人在 GitHub 檢視

描述

### Describe the feature or problem you'd like to solve

Instead of just a session usage, please include usage for the billing month

### Proposed solution

I want to be able to monitor my monthly usage stats

### Example prompts or workflows

/usage --month --json

### Additional context

_No response_

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