add dtos for the open api spec

dotnet/SafelyYou/Api/ErrorResponse.cs

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+using System.Text.Json.Serialization;
+
+namespace SafelyYou.Api;
+
+public record ErrorResponse(
+    [property: JsonPropertyName("msg")] string Msg
+);

dotnet/SafelyYou/Api/GetDeviceStatsResponse.cs

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+using System.Text.Json.Serialization;
+
+namespace SafelyYou.Api;
+
+public record GetDeviceStatsResponse(
+    [property: JsonPropertyName("avg_upload_time")] string AvgUploadTime,
+    [property: JsonPropertyName("uptime")] double Uptime
+);

dotnet/SafelyYou/Api/HeartbeatRequest.cs

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+using System.Text.Json.Serialization;
+
+namespace SafelyYou.Api;
+
+public record HeartbeatRequest(
+    [property: JsonPropertyName("sent_at")] DateTimeOffset SentAt
+);

dotnet/SafelyYou/Api/NotFoundResponse.cs

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+using System.Text.Json.Serialization;
+
+namespace SafelyYou.Api;
+
+public record NotFoundResponse(
+    [property: JsonPropertyName("msg")] string Msg
+);

dotnet/SafelyYou/Api/UploadStatsRequest.cs

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+using System.Text.Json.Serialization;
+
+namespace SafelyYou.Api;
+
+public record UploadStatsRequest(
+    [property: JsonPropertyName("sent_at")] DateTimeOffset SentAt,
+    [property: JsonPropertyName("upload_time")] long UploadTime
+);