chore: migrate http framework

[lucasnevespereira]

📝 Description

Migrate from gin framework to echo
Mostly because it is more minimalist and has better static file handling

r.Use(middleware.StaticWithConfig(middleware.StaticConfig{
	Filesystem: ui.BuildHTTPFS(),
	HTML5:      true,
}))

🗃️ Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring

📋 Checklist

• Code follows project conventions
• Tested locally
• Documentation updated (if needed)
• Maintains minimal philosophy

Additional notes

Regressions must be tested (auth, etc.)