Add Configuration Profiles

[Carrington-dev]

Description

Implement configuration profiles for different environments (dev, staging, prod).

Tasks

• Create profile system
• Add profile-specific file loading (.env.dev, .env.prod)
• Implement profile inheritance
• Add profile selection via environment variable
• Add profile selection via command line
• Create profile switching API
• Document profile usage patterns
• Add profile examples
• Test profile precedence

Acceptance Criteria

• Multiple profiles supported
• Profile switching seamless
• Inheritance works correctly
• Well documented