Refactor webui() to improve code structure and modularity

[lucassantos540]

This PR refactors the webui() function by breaking it down into smaller, well-defined helper functions.

Changes include:

• Extracting temporary directory cleanup into clear_temp_dir()
• Separating UI setup into configure_ui()
• Encapsulating auto-launch browser logic in decide_auto_launch()
• Moving interface launching to launch_interface()
• Isolating middleware protection in protect_app()
• Grouping API setup in configure_apis()
• Adding a dedicated function monitor_commands() for server command handling

These changes improve readability, make the code easier to maintain, and facilitate future enhancements or debugging.