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/Components/Routes.razor

@@ -0,0 +1,21 @@
+<Router AppAssembly="typeof(App).Assembly"
+        AdditionalAssemblies="new[] { typeof(DeepDrftWeb.Client._Imports).Assembly, typeof(DeepDrftCms._Imports).Assembly, typeof(AuthBlocksWeb._Imports).Assembly }">
+    <Found Context="routeData">
+        <AuthorizeRouteView RouteData="routeData" DefaultLayout="typeof(DeepDrftWeb.Client.Layout.MainLayout)">
+            <NotAuthorized>
+                @{
+                    NavigationManager.NavigateTo($"account/login?returnUrl={Uri.EscapeDataString(NavigationManager.Uri)}", forceLoad: true);
+                }
+            </NotAuthorized>
+        </AuthorizeRouteView>
+        <FocusOnNavigate RouteData="routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <PageTitle>Not found</PageTitle>
+        <LayoutView Layout="typeof(DeepDrftWeb.Client.Layout.MainLayout)">
+            <p role="alert">Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>
+
+@inject NavigationManager NavigationManager