Add Steam auth, platform validators & name gen

RecNet.Application/Profiles/ProfileDto.cs

@@ -1,8 +1,12 @@
+using System.Text.Json.Serialization;
+
 namespace RecNet.Application.Profiles;
 
 public class ProfileDTO
 {
+    [JsonPropertyName("ProfileId")]
     public Guid ProfileId { get; init; }
 
+    [JsonPropertyName("Name")]
     public required string Name { get; init; }
 }