feat: support backend-specific max-vram budgets #2604

Job	Run time
ubuntu-latest-cmake	7m 8s
Build and push container images (cuda, linux/amd64, ubuntu-latest)	16m 17s
windows-latest-cmake (vulkan, -DSD_VULKAN=ON -DSD_BUILD_SHARED_LIBS=ON)	8m 21s
Build and push container images (vulkan, linux/amd64, ubuntu-latest)	8m 30s
Build and push container images (musa, linux/amd64, ubuntu-latest)	51m 15s
windows-latest-cmake (avx2, -DGGML_NATIVE=OFF -DGGML_AVX2=ON -DSD_BUILD_SHARED_LIBS=ON)	4m 1s
ubuntu-latest-rocm (7.2.1, gfx908;gfx90a;gfx942;gfx1030;gfx1031;gfx1032;gfx1100;gfx1101;gfx1102;g...	1h 25m 5s
macOS-latest-cmake	6m 42s
Build and push container images (sycl, linux/amd64, ubuntu-latest)	16m 29s
windows-latest-cmake (cuda12, -DSD_CUDA=ON -DSD_BUILD_SHARED_LIBS=ON -DCMAKE_CUDA_ARCHITECTURES='...	2h 13m 13s
ubuntu-latest-cmake-vulkan	11m 12s
windows-latest-cmake-hip	46m 54s
windows-latest-rocm	3h 5m 26s
windows-latest-cmake (avx, -DGGML_NATIVE=OFF -DGGML_AVX=ON -DGGML_AVX2=OFF -DSD_BUILD_SHARED_LIBS...	4m 17s
windows-latest-cmake (avx512, -DGGML_NATIVE=OFF -DGGML_AVX512=ON -DGGML_AVX=ON -DGGML_AVX2=ON -DS...	4m 10s
ubuntu-latest-rocm (7.13.0, gfx906;gfx908;gfx90a;gfx942;gfx950;gfx1010;gfx1011;gfx1012;gfx1030;gf...	1h 57m 48s
Build and push container images (cuda, linux/arm64, ubuntu-24.04-arm, -spark, CUDA_VERSION=13.0.0...	17m 46s
windows-latest-cmake (noavx, -DGGML_NATIVE=OFF -DGGML_AVX=OFF -DGGML_AVX2=OFF -DGGML_FMA=OFF -DSD...	4m 32s
release	2m 23s
	12h 11m 29s

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