Dashboard usage records not updating — /internal/usage endpoint returns stale data

Describe the bug
The usage/billing history on the web dashboard (commandcode.ai) hasn't been updating. The /internal/usage API endpoint is returning stale data — the latest record is from July 2nd, even though new API calls have been made in the last 24+ hours.

Balance refresh still works fine, it's specifically the usage records endpoint that's stuck.

To Reproduce

1. Make a new API call with command-code
2. Go to commandcode.ai dashboard → usage history
3. Latest API call not listed
4. Or directly: curl 'https://api.commandcode.ai/internal/usage?limit=5' with valid session cookie — observe latest createdAt is stuck at July 2nd, no newer records appear

Expected behavior
Usage records should appear within minutes of each API call.

Additional context

• Balance/credits refresh works normally
• The API returns HTTP 200 with data, but the data itself is stale
• This affects both the web dashboard and any third-party apps relying on this endpoint

先定位 /internal/usage 端點處理程式，並追蹤它讀取使用量記錄的方式；將該路徑與仍正常運作的餘額重新整理路徑進行比較。使用 curl 請求重現過時的回應，並在新的 API 呼叫於幾分鐘內出現在端點和儀表板中時確認完成。