vulkan: run the engine on the game's device, without staging

Native Vulkan NGX callers now get d4r's own network for presets K, M and L,
recorded straight into the caller's command buffer on the game's VkDevice with
the same GameUpscaler/GameUpscalerM adapters the D3D12 path uses through
vkd3d-proton. No CPU staging, CUDA evaluation or host wait. D4R_VULKAN_ENGINE=0
keeps the staging path, and anything the engine does not cover still goes there
with a logged reason.

- Inputs are sampled through the caller's views (SHADER_READ_ONLY_OPTIMAL, or
  GENERAL with D4R_VULKAN_INPUT_GENERAL=1); depth/stencil views get a depth-only
  view. The output must be an RGBA16F (or RGB10A2 with an RGB10 model) storage
  image the engine writes directly, since the resource contract gives STORAGE
  usage only.
- Every recording ends with an event; engine objects of a released feature are
  destroyed once all recorded events fired, or at shutdown.
- GetFeatureDeviceExtensionRequirements reports VK_KHR_cooperative_matrix and
  VK_EXT_shader_float8 where available. It applies d4r.ini first: games ask
  before NGX init, and engine_requested() would otherwise cache "off".
- The engine accepts R16G16_SNORM motion vectors (Enshrouded).
- Engine model loaders accept a native device (VulkanInterop::native).
- Harness: D4R_HARNESS_ENGINE_DEVICE=1 (1.3 device with the engine's
  features), D4R_HARNESS_ALLOW_BLACK=1 (staging K's black reset frame).

Harness vs the staging path (RX 9070, GE-Proton11-7, 640x360 -> 1280x720):
K 99.6 % bit-identical, rest within one half-float ulp; M 52.7 dB, L 54.3 dB
PSNR; dynamic, recreate and discard pass for K and M. In game, Enshrouded runs
preset M on this path (docs/vulkan.md, SUPPORTED_GAMES.md).

Signed-off-by: itchyfeetleech <[email protected]>

engine/game.cpp

@@ -16,7 +16,8 @@ bool gameColorFormat(VkFormat format) {
     }
 }
 bool gameMotionFormat(VkFormat format) {
-    return format == VK_FORMAT_R16G16_SFLOAT || format == VK_FORMAT_R32G32_SFLOAT ||
+    // R16G16_SNORM (Enshrouded): sampled as floats in [-1, 1]; MV.Scale carries them to pixels as for float vectors.
+    return format == VK_FORMAT_R16G16_SFLOAT || format == VK_FORMAT_R32G32_SFLOAT || format == VK_FORMAT_R16G16_SNORM ||
            format == VK_FORMAT_R16G16B16A16_SFLOAT || format == VK_FORMAT_R32G32B32A32_SFLOAT;
 }
 bool gameDepthFormat(VkFormat format, VkImageAspectFlags aspect) {