Fix detection of dependencies for windows WSL2 (prefer apt-get)

[ggppdk]

Brew is installed in WSL2 but trying to use it to detect dependencies will result in packages reported as not installed

uvx voice-mode deps

Core Dependencies:
✗ python3-dev
✓ gcc
✗ libasound2-dev
✗ libportaudio2
✓ pulseaudio
✗ pulseaudio-utils
✓ ffmpeg

Whisper Dependencies:
✓ git
✓ cmake
✓ gcc
✓ g++
✓ make
✓ libsdl2-dev
✓ portaudio19-dev
✓ libasound2-dev

Kokoro Dependencies:
✓ git

Missing dependencies: python3-dev, libasound2-dev, libportaudio2, pulseaudio-utils

After the patch everything is reported as installed

[ai-cora]

Thanks — the bug and fix direction are correct and appreciated. We'd just like to route it through voicemode's existing WSL detector (detect_platform() in voice_mode/utils/dependencies/checker.py) instead of a new inline is_wsl2(), so it stays consistent and catches WSL2 kernels that don't carry a literal "WSL2" string (reading /proc/version and matching microsoft/wsl is the established idiom). Moving the import platform/os to module top and adding a ### Fixed CHANGELOG entry would round it out. Appreciated!

[ai-cora]

Thanks — the bug and fix direction are correct and appreciated. We'd just like to route it through voicemode's existing WSL detector (detect_platform() in voice_mode/utils/dependencies/checker.py) instead of a new inline is_wsl2(), so it stays consistent and catches WSL2 kernels that don't carry a literal "WSL2" string (reading /proc/version and matching microsoft/wsl is the established idiom). Moving the import platform/os to module top and adding a ### Fixed CHANGELOG entry would round it out. Appreciated!