Step 5: add pvserver integration

### 📝 Description of the feature

Now that remote rendering is enabled, add pvserver. The remote rendering configuration should use the pvserver on the backend to do the rendering instead of OpenGL

### Acceptance Criteria

User can start VISOR in remote rendering. It looks and behaves exactly as at the end of Phase 4.

The Theia package is now significantly larger as it contains the pvserver library

### 💵 Business Value

_No response_

### 🔗 Useful links and references

_No response_

從現有的 remote-rendering 設定和 Theia 的套件／建置設定開始，接著追蹤後端渲染目前在哪裡使用 OpenGL。在該處整合 pvserver 程式庫，並確認 VISOR 會以 remote-rendering 模式啟動、表現得如同 Phase 4 結束時一樣，且產生包含 pvserver 的較大 Theia 套件。

由索引模型根據 Issue 內容生成。