fix: refactor install script into modular architecture for maintainability

Refactor monolithic 706-line install.sh into well-organized modules following software engineering best practices:

Modular Architecture (scripts/lib/):
- ui.sh (36 lines) - Color codes and print functions
- utils.sh (49 lines) - Common utilities and jq installation
- download.sh (48 lines) - GitHub API and file download functions
- files.sh (109 lines) - Claude CodePro file management
- dependencies.sh (191 lines) - All dependency installations (NVM, Node.js, Python, etc.)
- shell.sh (100 lines) - Shell configuration and alias management

Main install.sh (343 lines):
- Bootstrap functionality to download lib modules for curl | bash support
- Configuration constants
- Source all modules
- Main installation orchestration

Benefits:
- 51% reduction in main script size (706 → 343 lines)
- Single Responsibility Principle - each module has clear purpose
- DRY principle applied throughout
- Improved maintainability and testability
- Better code organization and readability
- Flexible NVM detection for dev containers and local environments
- All syntax checks pass

No Breaking Changes:
- Maintains curl | bash installation method
- All existing functionality preserved
- Same user experience

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: maxritter

.gitignore

@@ -15,6 +15,7 @@ downloads/
 eggs/
 .eggs/
 lib/
+!scripts/lib/
 lib64/
 parts/
 sdist/