Initial Blazor Web App template

Rider-generated Blazor Web App (net10.0, interactive render mode None,
no auth scaffold, no sample pages). Includes Rider auto-formatting.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Elternbeirat.Web/Program.cs

@@ -0,0 +1,26 @@
+using Elternbeirat.Web.Components;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddRazorComponents();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error", createScopeForErrors: true);
+    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+    app.UseHsts();
+}
+
+app.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);
+app.UseHttpsRedirection();
+
+app.UseAntiforgery();
+
+app.MapStaticAssets();
+app.MapRazorComponents<App>();
+
+app.Run();