Add design system foundation and Git workflow documentation

This commit introduces a comprehensive design system based on design tokens and establishes our Git workflow for team collaboration.

Design System

• Implemented 3-tier token hierarchy (primitive → semantic → component)
• Added OKLCH color format for better contrast and accessibility
• Created responsive system with 9 breakpoints (320px - 2560px+)
• Set up Tailwind CSS v4 integration with CSS variables
• Added theme management utilities (light/dark modes)

Git Workflow

• Established branching model (main → develop → feature/*)
• Created GitLab CI/CD pipeline configuration
• Documented component development lifecycle
• Set up non-blocking parallel development strategy

Documentation Structure

• Organized team documentation in docs/team/
• Updated .gitignore to exclude local/personal docs
• Created architecture and workflow guides

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com