chore: remove all graphics backends (Raylib, OpenTK, Vulkan/Silk.NET) — prepare for pure Vulkan P/Invoke rewrite

src/Engine.Graphics/IRenderer.cs

@@ -1,31 +0,0 @@
-using Engine.Core;
-using Flecs.NET.Core;
-
-namespace Engine.Graphics;
-
-/// <summary>
-/// Renders the ECS world and exposes screenshot capture.
-/// Implemented by concrete graphics backends.
-/// </summary>
-public interface IRenderer : IDisposable
-{
-    /// <summary>
-    /// Render one frame of the ECS world and present it.
-    /// </summary>
-    void RenderWorld(World world);
-
-    /// <summary>
-    /// Request a screenshot of the next rendered frame to be saved to disk.
-    /// </summary>
-    void RequestScreenshot(string outputPath);
-
-    /// <summary>
-    /// True if a screenshot has been requested but not yet captured.
-    /// </summary>
-    bool IsScreenshotRequested { get; }
-
-    /// <summary>
-    /// Provider that can asynchronously capture the current frame to PNG bytes.
-    /// </summary>
-    IScreenshotProvider ScreenshotProvider { get; }
-}