Fix Vulkan support and provide instructions if Vulkan is not supported

[JackAdamsJenkins]

Fixes #285

Add Vulkan support check and instructions for installation if not supported.

• Add a step in docs/DEBUG.md to install Vulkan runtime and check Vulkan support.
• Add a command in desktop/src-tauri/src/cmd/mod.rs to check Vulkan support and provide instructions if Vulkan is not supported.
• Update desktop/src-tauri/src/setup.rs to check for Vulkan support during application setup and provide instructions if Vulkan is not supported.
• Add the check_vulkan command to the list of commands in desktop/src-tauri/src/main.rs.

---

For more details, open the Copilot Workspace session.