scaffold sMusic: Tauri v2 player core (audio/library/tags/discord/tray) + cover relay + CI

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src-tauri/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "smusic-tauri"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "smusic_tauri_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = ["tray-icon", "protocol-asset"] }
+tauri-plugin-dialog = "2"
+tauri-plugin-single-instance = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+rodio = "=0.22.2"
+lofty = "0.25"
+image = "0.25"
+walkdir = "2"
+blake3 = "1"
+ureq = "2"