fix(unit-2-auth): Redirect to /setup on API failure; store owner display name

- Router catch block now falls back to { initialized: false } instead of
  silently continuing, preventing unwanted redirect to /login when the
  API call fails at startup
- Add Name field to CreateOwnerRequest and propagate to ApplicationUser.DisplayName
  so the owner's display name is stored during initial setup

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/router.tsx

@@ -91,9 +91,11 @@ const rootRoute = createRootRouteWithContext<RouterContext>()({
         let status: SetupStatus;
         try {
             status = await fetchSetupStatus();
-        } catch {
-            // Network failure — let routes render; API calls will surface errors.
-            return;
+        } catch (err) {
+            // On network failure, assume not initialized so the user can set up
+            // the system once the backend is reachable. Logging helps debugging.
+            console.warn('[InitGuard] Setup status check failed, assuming not initialized:', err);
+            status = { initialized: false };
         }
 
         const onSetup = location.pathname === '/setup';