feat: Linux support, AMD ROCm, Whisper Turbo, and spawn fix

Cherry-picked and adapted from PR #89 and #214:

- Linux audio capture via PulseAudio/PipeWire monitor sources (cpal)
- AMD ROCm GPU support: HSA_OVERRIDE_GFX_VERSION env var, ROCm detection
- Whisper Turbo model (openai/whisper-large-v3-turbo) in all endpoints
- Cleaner Whisper language handling via generate_kwargs
- tauri::async_runtime::spawn fix to prevent panic on app shutdown
- Enable Linux (ubuntu-22.04) in release CI matrix

.github/workflows/release.yml

@@ -22,10 +22,10 @@ jobs:
             args: "--target x86_64-apple-darwin"
             python-version: "3.12"
             backend: "pytorch"
-          # - platform: 'ubuntu-22.04'
-          #   args: ''
-          #   python-version: '3.12'
-          #   backend: 'pytorch'
+          - platform: "ubuntu-22.04"
+            args: ""
+            python-version: "3.12"
+            backend: "pytorch"
           - platform: "windows-latest"
             args: ""
             python-version: "3.12"