feat: initiale Implementierung von corsairctl

Rust CLI-Tool für Corsair Bragi-Geräte (HS80 RGB Wireless, etc.).
Implementiert Protokoll-Kern, HID-Kommunikation, BragiDevice mit
RAII-Lifecycle, CLI-Subcommands (battery, sidetone, led, info, json,
udev), ALSA-Sidetone-Steuerung und Waybar-JSON-Output.

24 Unit-Tests für Packet-Bau, Response-Parsing und Property-Enums.

Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "corsairctl"
+version = "0.1.0"
+edition = "2024"
+description = "CLI tool for Corsair Bragi-protocol devices (HS80, etc.)"
+license = "MIT"
+
+[dependencies]
+hidapi = "2"
+alsa = "0.9"
+clap = { version = "4", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"