Fix Windows NVAPI loading the gfx1101 build on every other AMD GPU

0.1.5 shipped one d4r/zluda/nvapi64.dll (the gfx1101 build) for all
targets, and compat_nvapi_path() preferred it over d4r/nvapi/<arch>/.
Nothing on Windows ever set D4R_GPU_ARCH, so on any other GPU NVAPI
failed with "No selected gfx1101 device", NGX CUDA init failed, and
DLSS stayed unavailable (black frames, no OptiScaler upscaler section).

- Select the NVAPI per architecture; never fall back to a shared DLL
  in a multi-target folder, and report a missing build by name.

- The loader and runtime publish D4R_GPU_ARCH and D4R_GPU_LUID for the
  game's adapter, so NVAPI picks the right device with several GPUs.

- nvapi64.dll exports the target it was built for; the runtime refuses
  a mismatch, and the packager and d4r-check read the same marker.

- Release packaging no longer ships d4r/zluda/nvapi64.dll and rejects
  NVAPI builds for the wrong target, without a marker, or missing.

- Move target resolution, device matching and loader choice into
  gpu_selection.h; regression tests cover all 11 targets, bad or
  missing D4R_GPU_ARCH, mixed installs, multi-GPU and missing files.

- d4r-check: accept the FSR keys in the shipped d4r.ini.

scripts/windows/package-windows-release.ps1

@@ -64,7 +64,10 @@ foreach ($gpu in $selected) {
         # One GPU-query tool serves every target: it reports each device's real architecture.
         if ($relative -eq 'd4r/d4r_gpu_inventory.exe') { if (!$inventoryStaged) { Stage $path 'd4r/d4r_gpu_inventory.exe'; $inventoryStaged=$true } }
         elseif ($relative -eq 'd4r/_nvngx.dll') { Stage $path "d4r/_nvngx_$arch.dll" }
-        elseif ($relative -eq 'd4r/nvapi/nvapi64.dll') { Stage $path "d4r/nvapi/$arch/nvapi64.dll" }
+        elseif ($relative -eq 'd4r/nvapi/nvapi64.dll') { Assert-D4RNvapiTarget $path $arch; Stage $path "d4r/nvapi/$arch/nvapi64.dll" }
+        # The copy beside nvcuda.dll is one GPU's build: it is never shared. Each target's own build ships in
+        # d4r/nvapi/<arch>/ (above); the old shared copy made every GPU load the first target's NVAPI.
+        elseif ($relative -eq 'd4r/zluda/nvapi64.dll') { }
         elseif ($relative -like 'd4r/pixel_convert_*.hsaco') { Stage $path $relative }
         elseif ($relative.StartsWith('d4r/native/')) { Stage $path ("d4r/native/$arch/" + $relative.Substring('d4r/native/'.Length)) }
         elseif ($relative -eq 'd4r/nvapi/backend/nvapi64.dll' -or $relative -eq 'OptiScaler.dll' -or $relative.StartsWith('licenses/') -or
@@ -76,6 +79,7 @@ foreach ($gpu in $selected) {
         # Installer-only files (launcher, PowerShell installer, docs) are not part of a drag-in install.
     }
     if ($objects -ne 17) { throw "Expected 17 code objects for $arch" }
+    if (!(Test-Path -LiteralPath (Join-Path $PackageRoot "d4r/nvapi/$arch/nvapi64.dll") -PathType Leaf)) { throw "No d4r/nvapi/nvapi64.dll in the $arch input; the release needs one NVAPI build per target." }
     $commonStaged=$true
     $targets[$arch]=@{binarySourceCommit=$metadata.d4rCommit; hardwareValidation=$metadata.hardwareValidation;
         nativeFp8M=[bool]$metadata.nativeFp8M; tokenLanesM=[bool]$metadata.tokenLanesM}