Space.jsx : Add Altitude & Velocity via Alternative API in Space.jsx

Integrate altitude and velocity data for the International Space Station (ISS) using a free and reliable alternative API.
Currently, the dashboard in Space.jsx displays basic ISS information. This enhancement aims to enrich the data visualization by adding live altitude and velocity readings.

Requirements:

Research and select a free API providing ISS altitude and velocity (e.g., Open Notify, Where The ISS At? API).
Fetch and display the ISS altitude (in kilometers) and velocity (in km/h or mph).
Ensure data updates dynamically along with existing ISS location info.
Format and label the values clearly for better readability.

Acceptance Criteria:

✅ Altitude and velocity data successfully retrieved from an alternative API.
✅ Data displayed alongside other ISS information on the dashboard.
✅ Values auto-refresh in sync with the current ISS position updates.
✅ Graceful handling of API errors (fallback or “data unavailable” message).

Bonus (Optional):

Add small visual indicators (📈 icons or motion animation) for velocity changes.
Allow user to toggle between metric (km/h) and imperial (mph) units.

從 Space.jsx 開始，追蹤 dashboard 目前如何取得及重新整理 ISS 位置資料。比較建議的免費 API，然後將高度和速度整合到現有的顯示流程中，使用易讀的單位，並處理資料無法使用的狀態；完成的標準是兩個值都會隨位置一起重新整理，且 API 失敗能夠妥善處理。

由索引模型根據 Issue 內容生成。