chore: import upstream snapshot with attribution

dotnet/samples/Demos/VoiceChat/Options/AudioOptions.cs

@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+public class AudioOptions
+{
+    // Audio configuration constants, not part of appsettings, not intended to be changed
+    public const int SampleRate = 16000;
+    public const int Channels = 1;
+    public const int BitsPerSample = 16;
+    public const int BufferMilliseconds = 20;
+}

dotnet/samples/Demos/VoiceChat/Options/ChatOptions.cs

@@ -0,0 +1,17 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.ComponentModel.DataAnnotations;
+
+public class ChatOptions
+{
+    public const string SectionName = "Chat";
+
+    [Required]
+    public string SystemMessage { get; set; } = string.Empty;
+
+    // Chat response streaming constants
+    public int StreamingChunkSizeThreshold { get; set; } = 100;
+    public double Temperature { get; set; } = 0.7;
+    public int MaxTokens { get; set; } = 500;
+    public double TopP { get; set; } = 0.9;
+}

dotnet/samples/Demos/VoiceChat/Options/OpenAIOptions.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.ComponentModel.DataAnnotations;
+
+public class OpenAIOptions
+{
+    public const string SectionName = "OpenAI";
+
+    [Required]
+    public string ApiKey { get; set; } = string.Empty;
+
+    [Required]
+    public string ChatModelId { get; set; } = "gpt-4";
+
+    [Required]
+    public string TranscriptionModelId { get; set; } = "gpt-4o-transcribe";
+
+    [Required]
+    public string SpeechModelId { get; set; } = "gpt-4o-mini-tts";
+}