Refactor: Reorganize project structure by moving core components into dedicated directories and introducing new configuration and API models.

Api/Models/WhisperResponse.cs

@@ -0,0 +1,9 @@
+using System.Text.Json.Serialization;
+
+namespace Toak.Api.Models;
+
+public class WhisperResponse
+{
+    [JsonPropertyName("text")]
+    public string Text { get; set; } = string.Empty;
+}