Progress Overhaul + Profile Page and a LOT more! (#4262)

Co-authored-by: Amelia <77553571+Fesaa@users.noreply.github.com>
Co-authored-by: Robbie Davis <robbie@therobbiedavis.com>

API/Entities/User/AppUserExternalSource.cs

@@ -0,0 +1,12 @@
+namespace API.Entities;
+
+public class AppUserExternalSource
+{
+    public int Id { get; set; }
+    public required string Name { get; set; }
+    public required string Host { get; set; }
+    public required string ApiKey { get; set; }
+
+    public int AppUserId { get; set; }
+    public AppUser AppUser { get; set; }
+}