Integrate SignalR to provide real-time dashboard update notifications.
- Added DashboardsHub and DashboardChangeNotifier on the backend.
- Modified SqlDashboardStorage to trigger notifications on changes.
- Registered SignalR services and mapped the hub endpoint.
- Updated Blazor clients to connect to the hub and refresh dashboards on change.
- Added SignalR client packages and necessary DI/configuration.
Added DevExpress Dashboard to ASP.NET Core API and both Blazor WASM/Server frontends. Configured dashboard storage, sample data source, and API endpoint. Updated Blazor projects with dashboard packages, styles, and a new dashboard page. Navigation and configuration updated to support dashboard integration.
Added new Blazor Server project `DbFirst.BlazorWebApp` with core UI components, pages, and static assets. Updated solution file to include the project. Also added `bootstrap.min.css.map` to support CSS debugging in browser developer tools.
