fix: default GPUs setting

[vansangpfiev]

Describe Your Changes

This pull request introduces several changes to enhance GPU handling in the codebase, including the addition of a GpuType enum, updates to the GPU struct, and improvements in GPU activation logic. The most important changes are summarized below:

Enhancements to GPU Handling:

• Added GpuType enum to classify different types of GPUs (kGpuTypeOther, kGpuTypeIntegrated, kGpuTypeDiscrete, kGpuTypeVirtual, kGpuTypeCpu, kGpuTypeMaxEnum). ([engine/common/hardware_common.hR72-R81](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-adc20b97e31aa35d61ede3a2523f0126b79c4f0a2008165890d01e5ba9a6f335R72-R81))

• Updated GPU struct to include a new gpu_type field for storing the type of GPU. ([engine/common/hardware_common.hR93](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-adc20b97e31aa35d61ede3a2523f0126b79c4f0a2008165890d01e5ba9a6f335R93))

Improvements in GPU Activation Logic:

• Modified HardwareService::UpdateHardwareInfos to deactivate integrated GPUs by default and only activate Nvidia GPUs if both AMD and Nvidia GPUs are present. ([engine/services/hardware_service.ccL326-R354](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-6c5bdad74c539cf749ffac42cc1728ea62c51388ece867102fd2ce2e4fd1c956L326-R354))

Vendor Constants and GPU Type Integration:

• Changed vendor constants to use a consistent naming convention (kNvidiaVendor, kAmdVendor, kIntelVendor, kArmVendor) and added corresponding string constants (kAmdStr, kNvidiaStr, kIntelStr, kArmStr). ([engine/utils/hardware/gpu/vulkan/vulkan_gpu.hL27-R46](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-4d54c52435d403a598d3f7cf4b82bbc50ec768d7ccde9d107a552fe4faa2e385L27-R46))

• Updated VulkanGpu class to use the new vendor constants and set the gpu_type field based on the device type. ([[1]](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-4d54c52435d403a598d3f7cf4b82bbc50ec768d7ccde9d107a552fe4faa2e385L449-R455), [[2]](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-4d54c52435d403a598d3f7cf4b82bbc50ec768d7ccde9d107a552fe4faa2e385L460-R466))

• Updated GetGPUInfo function to set the gpu_type field to GpuType::kGpuTypeDiscrete for all GPUs. ([engine/utils/hardware/gpu_info.hL58-R59](https://github.com/menloresearch/cortex.cpp/pull/2029/files#diff-9c36f24988079b524e8b6e58945df24ca2ce26a3f02d95fa4c43a3fa9ef64413L58-R59))

Fixes Issues

• idea: activated GPUs by default #2018

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed