Refactor app architecture and clean local artifacts

Backend/Security/HttpContextSessionExtensions.cs

@@ -0,0 +1,14 @@
+using Backend.Domain;
+
+namespace Backend.Security;
+
+public static class HttpContextSessionExtensions
+{
+    private const string SessionItemKey = "__current_session";
+
+    public static void SetCurrentSession(this HttpContext context, UserSession session) =>
+        context.Items[SessionItemKey] = session;
+
+    public static UserSession? GetCurrentSession(this HttpContext context) =>
+        context.Items.TryGetValue(SessionItemKey, out var value) ? value as UserSession : null;
+}