Starting work on Shared Files

RelayShared/Rtc/RtcModels.cs

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+using SurrealDb.Net.Models;
+
+namespace RelayShared.Rtc;
+
+public class RtcSignalTypes
+{
+    public const string Offer = "rtc_offer";
+    public const string Answer = "rtc_answer";
+    public const string Candidate = "rtc_candidate";
+    public const string OfferUpdated = "rtc_offer_updated";
+    public const string AnswerUpdated = "rtc_answer_updated";
+}
+
+public class RtcJoinRequest
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+}
+
+public sealed class RtcSessionDescription
+{
+    public required string Type { get; set; }
+    public required string Sdp { get; set; }
+}
+
+public class RtcOffer : Record
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required RtcSessionDescription SessionDescription { get; set; }
+    // public required string Type { get; set; }
+    // public required string Sdp { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}
+
+public class RtcLeaveRequest
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+}
+
+public class RtcJoinResponse
+{
+    public required string ChannelId { get; set; }
+    public bool HasActiveCall { get; set; }
+    public bool IsOfferer { get; set; }
+    public string? OfferUser { get; set; }
+    public string? OfferSdp { get; set; }
+}
+
+public class RtcIceCandidate : Record
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required string Candidate { get; set; }
+    public string? SdpMid { get; set; }
+    public int? SdpMLineIndex { get; set; }
+    // public required string Direction { get; set; } // "offer" or "answer"
+    public DateTime CreatedAt { get; set; }
+}
+
+public class DBIceCandidate
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required IceCandidate Candidate { get; set; }
+}
+
+public class IceCandidate
+{
+    public required string candidate { get; set; }
+    public required string sdpMid { get; set; }
+    public required int sdpMLineIndex { get; set; }
+    public required string usernameFragment { get; set; }
+    
+}
+
+public class RtcAnswer : Record
+{
+    public required string ChannelId { get; set; }
+    public required string OfferUser { get; set; }
+    public required string AnswerUser { get; set; }
+    public required string Sdp { get; set; }
+    public DateTime CreatedAt { get; set; }
+}
+
+public sealed class RtcActiveCall : Record
+{
+    public required string ChannelId { get; set; }
+    public string? OfferUser { get; set; }
+    public RtcSessionDescription? Offer { get; set; }
+    public RtcSessionDescription? Answer { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+    public bool IsActive { get; set; }
+}