feat(cli): set server as default command

[crodriguesbr]

Description

Set the server command as the default command when the user runs nfury without any arguments.

Changes

• Changed CommandApp() to CommandApp<ServerCommand>() in Program.cs to define the server as the default command

Motivation

This change improves the user experience by allowing users to start the web dashboard with a simple nfury command instead of requiring nfury server. Since the dashboard is the primary feature of the application, it makes sense for it to be the default behavior.

How to Test

1. Build the project: dotnet build
2. Run without arguments: dotnet run or ./nfury
3. Verify the web server starts automatically
4. Confirm other commands still work: nfury run, nfury server

Checklist

• Code follows the project's coding style
• Changes have been tested locally
• Documentation has been updated (if applicable)
• Tests have been added/updated (if applicable)