More work

Models/LMStudio/LmStudioUnloadModel.cs

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+using System;
+using System.Text.Json.Serialization;
+
+namespace PaperlessAI.Models.LMStudio;
+
+public class LmStudioUnloadModel
+{
+    [JsonPropertyName("instance_id")]
+    public required string InstanceId { get; set; }
+}