Implement macOS local MP3 discovery foundation

packages/apple/VelodyDomain/Sources/VelodyDomain/Models.swift

@@ -6,21 +6,30 @@ public enum DevicePlatform: String, Codable, Sendable, CaseIterable {
 }
 
 public struct LibraryTrack: Identifiable, Codable, Hashable, Sendable {
-    public let id: UUID
+    public let id: String
     public var title: String
     public var artist: String
     public var album: String?
+    public var durationSeconds: Double?
+    public var localFilePath: String
+    public var sha256: String?
 
     public init(
-        id: UUID = UUID(),
+        id: String = UUID().uuidString,
         title: String,
-        artist: String,
-        album: String? = nil
+        artist: String = "Unknown Artist",
+        album: String? = nil,
+        durationSeconds: Double? = nil,
+        localFilePath: String = "",
+        sha256: String? = nil
     ) {
         self.id = id
         self.title = title
         self.artist = artist
         self.album = album
+        self.durationSeconds = durationSeconds
+        self.localFilePath = localFilePath
+        self.sha256 = sha256
     }
 }