Refactor app architecture and clean local artifacts

Backend/Endpoints/AdminEndpointConventions.cs

@@ -0,0 +1,10 @@
+using Backend.Domain;
+using Backend.Security;
+
+namespace Backend.Endpoints;
+
+internal static class AdminEndpointConventions
+{
+    public static UserSession CurrentSession(HttpContext context) =>
+        context.GetCurrentSession() ?? throw new InvalidOperationException("Admin session missing from request context.");
+}