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Your First Blazor Web App: Template Options, Project Structure, App.razor, Routes.razor and Hot Reload

The --interactivity option of dotnet new blazor puts the code that runs in the browser into a separate .Client project for WebAssembly or Auto; two registrations in Program.cs and MapRazorComponents<App> produce the endpoints, and App.razor and Routes.razor set up the page skeleton and routing. We add Bookstore.Admin to Bookstore.slnx with central package management and show route parameters and constraints, hot reload with dotnet watch and the .NET 11 template changes with real output.