feat(render): refactor pipeline & shader system for DX12 WG

Major refactor of render pipeline and shader system:
- Replaced legacy shader properties with source generator and attribute-based HLSL struct generation.
- Introduced ShaderPropertiesRegistry for runtime property layout/code registration.
- Added modular IRenderPipeline, IRenderPipelineSettings, and IRenderPayload interfaces.
- Implemented GhostRenderPipeline and ECS-driven GPUScene management.
- Added experimental DirectX 12 Work Graph support.
- Refactored shader compilation, variant hashing, and caching.
- Updated APIs for consistency and improved codegen for registration.

These changes modernize the rendering infrastructure for advanced features like work graphs and dynamic pipelines.

BREAKING CHANGE: Shader DSL, pipeline, and property APIs have changed. Existing shaders and pipeline integrations must be updated.

src/Runtime/Ghost.Engine/RenderPipeline/GhostRenderPipeline.cs

@@ -0,0 +1,40 @@
+using Ghost.Graphics;
+using Ghost.Graphics.Core;
+
+namespace Ghost.Engine.RenderPipeline;
+
+internal class GhostRenderPipeline : IRenderPipeline
+{
+    private readonly RenderSystem _renderSystem;
+
+    private readonly GPUScene _gpuScene;
+
+    public GPUScene GPUScene => _gpuScene;
+
+    public GhostRenderPipeline(RenderSystem renderSystem)
+    {
+        _renderSystem = renderSystem;
+        _gpuScene = new GPUScene(renderSystem.GraphicsEngine.ResourceAllocator, renderSystem.GraphicsEngine.ResourceDatabase, 102_400u); // 102.4k objects should be enough for now
+    }
+
+    public void Render(RenderContext ctx, int frameIndex, IRenderPayload payload)
+    {
+        var ghostPayload = (GhostRenderPayload)payload;
+
+        var resourceManager = _renderSystem.ResourceManager;
+        var resourceDatabase = _renderSystem.GraphicsEngine.ResourceDatabase;
+
+        foreach (ref readonly var request in ghostPayload.RenderRequests)
+        {
+            if (!RenderPipelineUtility.GetViewAndProjectionMatrices(_renderSystem, in request, out var view, out var projection, out var screenSize))
+            {
+                continue;
+            }
+        }
+    }
+
+    public void Dispose()
+    {
+        throw new NotImplementedException();
+    }
+}