Some orgnization, and cleanup to come.

RelayServer/Models/Rtc/RtcOffer.cs

@@ -0,0 +1,12 @@
+using SurrealDb.Net.Models;
+
+namespace RelayServer.Models.Rtc;
+
+public class RtcOffer : Record
+{
+    public required string ChannelId { get; set; }
+    public required string Username { get; set; }
+    public required string Sdp { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}