Auris v1.0.7

Add GPU/CPU CI builds, Vulkan opt-in & logger

Split CI into separate GPU and CPU build jobs for Windows/Linux x86/x64, update artifact names and release packaging to produce GPU/CPU zips. Add a --with-vulkan premake option that switches the module name to auris-gpu and gates Vulkan-specific sources/links so Vulkan is opt-in (CPU-only builds no longer depend on libvulkan). Update server init to prefer auris-gpu and fall back to auris, and add a simple auris_logger addon (autorun + server logger) to print transcriptions to the server console. Add BUILD.md with full build instructions and reference it from README; bump VERSION to 1.0.7.