Initial scaffold: ytLive C# WPF project

- MVVM architecture (Models, ViewModels, Views, Services, Helpers)
- Models: Scene, Source, StreamConfig, StreamHealth, YouTubeChannel, ChatMessage
- Services: YouTubeAuthService (OAuth2), YouTubeStreamService (broadcasts/stream health),
  YouTubeChatService (live chat polling)
- ViewModels: MainViewModel with scene management, stream controls, chat
- MainWindow with dark theme: scene/source panel, preview area, chat panel, status bar
- Version roadmap: v0.1 (scenes, RTMP, OAuth2, chat, health) -> 1.0

Models/Scene.cs

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+namespace ytLive.Models;
+
+public class Scene
+{
+    public string Id { get; init; } = Guid.NewGuid().ToString();
+    public string Name { get; set; } = string.Empty;
+    public List<Source> Sources { get; set; } = new();
+}

Models/Source.cs

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+namespace ytLive.Models;
+
+public enum SourceType
+{
+    DisplayCapture,
+    WindowCapture,
+    Webcam,
+    Image,
+    TextOverlay
+}
+
+public class Source
+{
+    public string Id { get; init; } = Guid.NewGuid().ToString();
+    public string Name { get; set; } = string.Empty;
+    public SourceType Type { get; set; }
+    public bool IsEnabled { get; set; } = true;
+
+    // Display/Window capture
+    public int? MonitorIndex { get; set; }
+    public IntPtr? WindowHandle { get; set; }
+
+    // Webcam
+    public string? DeviceId { get; set; }
+
+    // Image
+    public string? FilePath { get; set; }
+
+    // Position/transform
+    public double X { get; set; }
+    public double Y { get; set; }
+    public double Width { get; set; }
+    public double Height { get; set; }
+    public double Opacity { get; set; } = 1.0;
+}

Models/StreamConfig.cs

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+namespace ytLive.Models;
+
+public enum StreamStatus
+{
+    Offline,
+    Connecting,
+    Streaming,
+    Error
+}
+
+public class StreamConfig
+{
+    public string Title { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public string StreamKey { get; set; } = string.Empty;
+    public string IngestUrl { get; set; } = "rtmp://a.rtmp.youtube.com/live2";
+    public bool IsLowLatency { get; set; } = true;
+    public int TargetBitrate { get; set; } = 6000;
+    public int TargetFps { get; set; } = 60;
+    public string Resolution { get; set; } = "1920x1080";
+}
+
+public class StreamHealth
+{
+    public StreamStatus Status { get; set; }
+    public double CurrentBitrate { get; set; }
+    public int DroppedFrames { get; set; }
+    public double FPS { get; set; }
+    public TimeSpan StreamDuration { get; set; }
+    public string? LastError { get; set; }
+
+    // YouTube-specific
+    public string? HealthStatus { get; set; }  // "good", "bad", "ok"
+    public string? HealthMessage { get; set; }
+}

Models/YouTube.cs

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+namespace ytLive.Models;
+
+public class YouTubeChannel
+{
+    public string ChannelId { get; set; } = string.Empty;
+    public string DisplayName { get; set; } = string.Empty;
+    public string ProfileImageUrl { get; set; } = string.Empty;
+    public string AccessToken { get; set; } = string.Empty;
+    public string RefreshToken { get; set; } = string.Empty;
+    public DateTime TokenExpiry { get; set; }
+}
+
+public class ChatMessage
+{
+    public string Id { get; init; } = Guid.NewGuid().ToString();
+    public string AuthorName { get; set; } = string.Empty;
+    public string AuthorChannelId { get; set; } = string.Empty;
+    public string AuthorImageUrl { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+    public DateTime Timestamp { get; set; }
+    public bool IsSuperChat { get; set; }
+    public double SuperChatAmount { get; set; }
+    public string? SuperChatCurrency { get; set; }
+    public bool IsMember { get; set; }
+    public string? MembershipLevel { get; set; }
+}