Refactor app architecture and clean local artifacts

Backend/Endpoints/AdminEndpoints.cs

@@ -0,0 +1,36 @@
+using Backend.Security;
+
+namespace Backend.Endpoints;
+
+public static class AdminEndpoints
+{
+    public static IEndpointRouteBuilder MapAdminEndpoints(this IEndpointRouteBuilder app)
+    {
+        var group = app.MapGroup("/api/admin")
+            .AddEndpointFilter<AdminSessionFilter>();
+
+        group.MapAdminSiteSettingsEndpoints();
+
+        var managerGroup = group.MapGroup(string.Empty)
+            .AddEndpointFilter(RequireAdminWorkspaceRole);
+
+        managerGroup.MapAdminDashboardEndpoints();
+        managerGroup.MapAdminSeasonManagementEndpoints();
+        managerGroup.MapAdminModerationEndpoints();
+
+        return app;
+    }
+
+    private static async ValueTask<object?> RequireAdminWorkspaceRole(
+        EndpointFilterInvocationContext context,
+        EndpointFilterDelegate next)
+    {
+        var session = AdminEndpointConventions.CurrentSession(context.HttpContext);
+        if (!AdminRoles.CanManageAdminWorkspace(session.Role))
+        {
+            return Results.Json(new { message = "This admin area requires an admin or owner role." }, statusCode: StatusCodes.Status403Forbidden);
+        }
+
+        return await next(context);
+    }
+}