Display premium request overage usage when personal allowance is exhausted

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

When a user exceeds their included monthly premium requests, extra requests are billed to the organization. The TUI currently shows "0% remaining" but doesn't display how many extra requests the user has consumed.

### Proposed solution

Current behavior

- Status shows "0% remaining" when personal allowance is exhausted
- No indication of overage consumption
- User has no visibility into billable overage requests they're generating

Proposed behavior

Show overage usage when allowance is exhausted, e.g.:

- 0% remaining • 42 over (127%)

Use case

- Users should understand when they're generating billable overage costs
- Helps with personal accountability and budget awareness
- Organizations may set spending caps; users should see consumption against those limits
- Avoids surprise when overage costs appear on billing

### Example prompts or workflows

_No response_

### Additional context

_No response_

从当前显示“0% remaining”的 TUI 状态显示开始，然后追踪个人配额和超额使用量是如何提供给它的。更新显示，使其包含超额数量和百分比，并验证已耗尽的配额会显示建议的格式，同时不改变正常的剩余配额状态。

由索引模型根据 Issue 内容生成。