lightfinder support, context pairing

LightlessSyncAPI/Dto/Group/GroupBroadcastRequestDto.cs

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+using MessagePack;
+
+namespace LightlessSync.API.Dto.Group;
+
+[MessagePackObject(keyAsPropertyName: true)]
+public sealed class GroupBroadcastRequestDto
+{
+    public required string GID { get; init; }
+    public string? HashedCID { get; set; }
+    public required bool Enabled { get; init; }
+}

LightlessSyncAPI/Dto/Group/GroupJoinHashedDto.cs

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+using LightlessSync.API.Data;
+using LightlessSync.API.Data.Enum;
+using MessagePack;
+
+namespace LightlessSync.API.Dto.Group;
+
+[MessagePackObject(keyAsPropertyName: true)]
+public record GroupJoinHashedDto(
+    GroupData Group,
+    string HashedPassword,
+    GroupUserPreferredPermissions GroupUserPreferredPermissions
+);