feat: pure Vulkan P/Invoke renderer — no wrappers, SDL3 window, SPIR-V shaders

- Engine.Graphics: restored interfaces (IRenderContext, IRenderer, RenderBackendFactory),
  loaders (ObjLoader, GltfLoader), ProceduralMesh, MeshMath, SceneSerializer
- Engine.Graphics.Vulkan: pure P/Invoke to libvulkan.so.1/vulkan-1.dll
  - VulkanNative: library loading, function pointer loading via vkGetInstanceProcAddr
  - Vk: static function cache for ~80 Vulkan functions, all delegate types
  - VulkanTypes: ~50 structs, ~20 enums matching Vulkan C headers
  - VulkanContext: instance, physical device, logical device, surface, memory types
  - VulkanSwapchain: swapchain, image views, depth image, render pass, framebuffers
  - VulkanPipeline: graphics pipeline, descriptor set layout, shader modules
  - VulkanBuffer: vertex/index/uniform buffers, staging, memory allocation
  - VulkanRenderer: command buffers, sync (semaphores/fences), render loop, 2 frames in flight
  - GLSL 450 shaders: PBR lighting (Fresnel, ACES, gamma), directional+point lights
  - Compiled to SPIR-V via @webgpu/glslang WASM
- CortexEngine.App: switched to vulkan backend, removed Raylib/OpenTK/ImGui refs
- Tests: all 66 pass (ObjLoader, MeshMath, ProceduralMesh, SceneSerializer, etc.)
- Camera tour: 16 poses, screenshots captured, clean shutdown

src/Engine.Graphics.Vulkan/VulkanRenderContext.cs

@@ -0,0 +1,40 @@
+using Engine.Core;
+using Engine.Graphics;
+
+namespace Engine.Graphics.Vulkan;
+
+public sealed class VulkanRenderContext : IRenderContext
+{
+    private readonly VulkanContext _context;
+    private readonly VulkanSwapchain _swapchain;
+    private readonly VulkanPipeline _pipeline;
+    private readonly VulkanRenderer _renderer;
+    private readonly Sdl3Window _window;
+
+    public IWindow Window => _window;
+
+    public VulkanRenderContext(int width, int height, bool enableValidation)
+    {
+        _window = new Sdl3Window("Cortex Engine", width, height, vulkanSurface: true);
+        _context = new VulkanContext(_window, enableValidation);
+        _swapchain = new VulkanSwapchain(_context, width, height);
+        _pipeline = new VulkanPipeline(_context, _swapchain.RenderPass);
+        _renderer = new VulkanRenderer(_context, _swapchain, _pipeline);
+    }
+
+    public IRenderer CreateRenderer() => _renderer;
+
+    public void Resize(int width, int height)
+    {
+        _renderer.OnResize();
+    }
+
+    public void Dispose()
+    {
+        _renderer.Dispose();
+        _pipeline.Dispose();
+        _swapchain.Dispose();
+        _context.Dispose();
+        _window.Dispose();
+    }
+}