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>

src/SlpModularCms.Modules.Identity/Controllers/SetupController.cs

@@ -25,7 +25,7 @@ public class SetupController : ControllerBase
     [HttpPost("owner")]
     public async Task<IActionResult> CreateOwner([FromBody] CreateOwnerRequest request)
     {
-        await _setupService.CreateInitialOwnerAsync(request.Email, request.Password);
+        await _setupService.CreateInitialOwnerAsync(request.Name, request.Email, request.Password);
         return Ok(new { Message = "Systeem succesvol geïnitialiseerd. De eerste eigenaar is aangemaakt." });
     }
 }