Initial commit — ferrosonic terminal Subsonic client

Terminal-based Subsonic music client in Rust featuring bit-perfect audio
playback via PipeWire sample rate switching, gapless playback, MPRIS2
desktop integration, cava audio visualizer with theme-matched gradients,
13 built-in color themes with custom TOML theme support, mouse controls,
artist/album browser, playlist support, and play queue management.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/subsonic/mod.rs

@@ -0,0 +1,9 @@
+//! Subsonic API client module
+
+#![allow(dead_code)]
+
+pub mod auth;
+pub mod client;
+pub mod models;
+
+pub use client::SubsonicClient;