Add real workspace channels

backend/src/Socialize.Api/Modules/Channels/Data/Channel.cs

@@ -0,0 +1,12 @@
+namespace Socialize.Api.Modules.Channels.Data;
+
+public class Channel
+{
+    public Guid Id { get; init; }
+    public Guid WorkspaceId { get; set; }
+    public required string Name { get; set; }
+    public required string Network { get; set; }
+    public string? Handle { get; set; }
+    public string? ExternalUrl { get; set; }
+    public DateTimeOffset CreatedAt { get; init; }
+}