Restructure into feature folders with code-behind and scoped CSS

Elternbeirat.Web/Features/Pages/ContentPage.razor.cs

@@ -0,0 +1,28 @@
+using Elternbeirat.Web.Services;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Http;
+
+namespace Elternbeirat.Web.Features.Pages;
+
+public partial class ContentPage
+{
+    [Parameter]
+    public string Slug { get; set; } = "";
+
+    private Page? _page;
+
+    protected override void OnParametersSet()
+    {
+        _page = PageService.Find(Slug);
+
+        // Unknown slug -> 404, so UseStatusCodePagesWithReExecute serves the
+        // /not-found page instead of an empty 200 response.
+        if (_page is null && HttpContext is not null)
+        {
+            HttpContext.Response.StatusCode = StatusCodes.Status404NotFound;
+        }
+    }
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
+}