feat: consolidate platform-specific backend support

- change the target backend to `vulkan` for linux
- add support for all backends for windows

src/winit_renderer.rs

@@ -155,9 +155,14 @@ impl WinitRenderer {
             wgpu::Backends::METAL
         }
 
-        #[cfg(not(target_os = "macos"))]
+        #[cfg(target_os = "linux")]
         {
             wgpu::Backends::VULKAN
         }
+
+        #[cfg(target_os = "windows")]
+        {
+            wgpu::Backends::all()
+        }
     }
 }