fix(routing): InteractiveServer routing, WASM interactivity declared at layout level

Routes moves to InteractiveServer so the server router always sees all
assemblies (including AuthBlocksWeb). MainLayout declares
@rendermode InteractiveWebAssembly — the single source of WASM
interactivity for all public pages. CmsLayout in DeepDrftCms provides
a server-rendered admin shell without the audio dock. Assembly-level
_Imports.razor files set the default layout for each group; no per-page
rendermode declarations needed. Routes.razor moves to the server host
(its correct home) carrying the full AdditionalAssemblies list.

DeepDrftWeb.Client/Layout/MainLayout.razor

@@ -1,4 +1,5 @@
-@using DeepDrftWeb.Client.Controls
+@rendermode InteractiveWebAssembly
+@using DeepDrftWeb.Client.Controls
 @using DeepDrftWeb.Client.Controls.AudioPlayerBar
 @using DeepDrftWeb.Client.Services
 @using DeepDrftWeb.Client.Common

DeepDrftWeb.Client/Routes.razor

@@ -1,24 +0,0 @@
-@inject NavigationManager NavigationManager
-
-<Router AppAssembly="typeof(_Imports).Assembly">
-    <Found Context="routeData">
-        <AuthorizeRouteView RouteData="routeData" DefaultLayout="typeof(Layout.MainLayout)">
-            <NotAuthorized>
-                @{
-                    NavigationManager.NavigateTo($"account/login?returnUrl={Uri.EscapeDataString(NavigationManager.Uri)}", forceLoad: true);
-                }
-            </NotAuthorized>
-        </AuthorizeRouteView>
-    </Found>
-    <NotFound>
-        @{
-            // Routes owned by server-side assemblies (e.g. /account/*) are not visible to the
-            // WASM router. Force a full-page reload so the server router handles them instead.
-            var path = new Uri(NavigationManager.Uri).AbsolutePath;
-            if (path.StartsWith("/account", StringComparison.OrdinalIgnoreCase))
-            {
-                NavigationManager.NavigateTo(NavigationManager.Uri, forceLoad: true);
-            }
-        }
-    </NotFound>
-</Router>

DeepDrftWeb.Client/_Imports.razor

@@ -10,4 +10,5 @@
 @using MudBlazor
 @using MudBlazor.Services
 @using MudBlazor.ThemeManager
-@using DeepDrftWeb.Client.Common
+@using DeepDrftWeb.Client.Common
+@layout DeepDrftWeb.Client.Layout.MainLayout