No mid-installation prompts or interruptions

Major Improvements:

• Move all interactive questions to the beginning of installation
• Users now provide all configuration upfront (domain, SSL, admin email)
• Installation runs unattended after initial configuration
• Display comprehensive summary before starting installation

Features:

• Interactive setup section with 3-step configuration flow
• Visual separators for better readability
• Clear installation summary with all settings
• Ubuntu 22.04/24.04 version check
• DNS A record verification
• CloudFlare SSL proxy warning

Bug Fixes:

• Improved demo credentials removal from Login.jsx
• More reliable file parsing with awk

User Experience:

• No mid-installation prompts or interruptions
• Better configuration flow and clarity
• Professional installation summary display