Step 4: remote rendering configuration addition

### 📝 Description of the feature

Step 4 of the remote rendering work.
Add a configuration for remote rendering where the user can start VISOR in remote rendering, and that is done on the server-side using OpenGL.

### Acceptance Criteria

User can start VISOR in "remote rendering". That looks and behaves correctly.

### 💵 Business Value

_No response_

### 🔗 Useful links and references

_No response_

No files, tests, or entry points are identified in the issue. Start by locating VISOR's configuration and startup path, then trace how rendering is selected and where server-side OpenGL is initialized; done means a user can start VISOR in remote-rendering mode and it behaves correctly.

索引モデルが issue の本文から書いたものです。