Add Turns on the footer of the cli

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

As User I need a turns counter in immediate view so I know when to /compact

### Proposed solution

It is not practical to count my own turns when in the throws of solving the next corporate challenge using AI and agents .
I am focused on completing the challenge - not AI usage

In one of the recommendations by Claude Sonnet 4.5 - /Compact at turn 25-30 (not turn xx) → saves xxxM+ tokens per long session

Having the Turns easily in view will enable my cognitive memory to remember to /compact more frequently

### Example prompts or workflows

_No response_

### Additional context

_No response_

首先定位 CLI 頁尾的渲染邏輯，以及 /compact 工作流程使用的工作階段狀態；該 issue 沒有指定檔案或測試。為頁尾新增回合計數，並驗證它在工作階段期間仍然可見且反映使用者的回合數。

由索引模型根據 Issue 內容生成。