feat(degree): /degree/degree_list returns owned ids

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Degree/DegreeListRequest.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Degree;
+
+[MessagePackObject]
+public class DegreeListRequest : BaseRequest
+{
+    [JsonPropertyName("degree_id")]
+    [Key("degree_id")]
+    public int DegreeId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Degree/DegreeListEntry.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Degree;
+
+[MessagePackObject]
+public class DegreeListEntry
+{
+    [JsonPropertyName("degree_id")]
+    [Key("degree_id")]
+    public int DegreeId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Degree/DegreeListResponse.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Degree;
+
+[MessagePackObject]
+public class DegreeListResponse
+{
+    [JsonPropertyName("user_degree_list")]
+    [Key("user_degree_list")]
+    public List<DegreeListEntry> UserDegreeList { get; set; } = new();
+}