feat(quic): replace probe UDP data plane with QUIC datagrams

backend/src/MoShiro.Backend.Api/Contracts/ApiJsonContext.cs

@@ -22,6 +22,7 @@ namespace MoShiro.Backend.Api;
 [JsonSerializable(typeof(DistributionDto))]
 [JsonSerializable(typeof(HeatmapDto))]
 [JsonSerializable(typeof(LineDto))]
+[JsonSerializable(typeof(QuicLineHealthDto))]
 [JsonSerializable(typeof(TestDto))]
 [JsonSerializable(typeof(PageDto<TestDto>))]
 [JsonSerializable(typeof(PageDto<KindDto>))]