Generated the JSON contracts of the stored data at compile time (#1148)

app/MindWork AI Studio/Chat/ChatJsonContext.cs

@@ -0,0 +1,17 @@
+using System.Text.Json.Serialization;
+
+using ERIContentType = AIStudio.Tools.ERIClient.DataModel.ContentType;
+
+namespace AIStudio.Chat;
+
+/// <summary>
+/// The contracts with which System.Text.Json reads and writes chats, built at compile time.
+/// </summary>
+/// <remarks>
+/// Two types with the same name need a name of their own for their contract, else the generator builds
+/// only the first of them and warns with SYSLIB1031.
+/// </remarks>
+[JsonSourceGenerationOptions(GenerationMode = JsonSourceGenerationMode.Metadata)]
+[JsonSerializable(typeof(ChatThread))]
+[JsonSerializable(typeof(ERIContentType), TypeInfoPropertyName = "ERIContentType")]
+internal sealed partial class ChatJsonContext : JsonSerializerContext;