Read heading and intro from the pages record on /posts and /events

Elternbeirat.Web/Features/Posts/PostList.razor

@@ -1,8 +1,19 @@
 @page "/posts"
 
-<PageTitle>Beiträge</PageTitle>
+@{
+    // Heading and intro come from the "posts" page record; fall back to a sensible
+    // default only if that record is missing, so the page still renders.
+    var title = _page?.Title ?? "Beiträge";
+}
 
-<h1>Beiträge</h1>
+<PageTitle>@title</PageTitle>
+
+<h1>@title</h1>
+
+@if (_page is not null && !string.IsNullOrWhiteSpace(_page.Body))
+{
+    <article>@Body</article>
+}
 
 @if (_unavailable)
 {