Add Linux support: cross-platform restart, nvidia-ml-py dep, README update

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -32,9 +32,10 @@ A Home Assistant integration exposes devices as entities for smart home automati
 - Color strip sources: audio-reactive, pattern generator, composite layering, audio-to-color mapping
 - Pattern templates with customizable effects
 
-### Audio Integration (Windows)
+### Audio Integration
 
 - Multichannel audio capture from any system device (input or loopback)
+- WASAPI engine on Windows, Sounddevice (PortAudio) engine on Linux/macOS
 - Per-channel mono extraction
 - Audio-reactive color strip sources driven by frequency analysis
 
@@ -64,7 +65,18 @@ A Home Assistant integration exposes devices as entities for smart home automati
 
 - Python 3.11+ (or Docker)
 - A supported LED device on the local network or connected via USB
-- Windows for GPU-accelerated capture engines and audio capture; Linux/macOS supported via MSS
+- Windows, Linux, or macOS — all core features work cross-platform
+
+### Platform Notes
+
+| Feature | Windows | Linux / macOS |
+| ------- | ------- | ------------- |
+| Screen capture | DXCam, BetterCam, WGC, MSS | MSS |
+| Audio capture | WASAPI, Sounddevice | Sounddevice (PulseAudio/PipeWire) |
+| GPU monitoring | NVIDIA (pynvml) | NVIDIA (pynvml) |
+| Android capture | Scrcpy (ADB) | Scrcpy (ADB) |
+| Monitor names | Friendly names (WMI) | Generic ("Display 0") |
+| Profile conditions | Process/window detection | Not yet implemented |
 
 ## Quick Start
 
@@ -104,7 +116,7 @@ wled-screen-controller/
 │   │   │   ├── capture/             # Screen capture, calibration, pixel processing
 │   │   │   ├── capture_engines/     # MSS, DXCam, BetterCam, WGC, Scrcpy backends
 │   │   │   ├── devices/             # WLED, Adalight, AmbileD, DDP clients
-│   │   │   ├── audio/               # Audio capture (Windows)
+│   │   │   ├── audio/               # Audio capture engines
 │   │   │   ├── filters/             # Post-processing filter pipeline
 │   │   │   ├── processing/          # Stream orchestration and target processors
 │   │   │   └── profiles/            # Condition-based profile automation