- Create scripts/common.sh with reusable log() function and color definitions
- Refactor backup.sh to use common.sh for consistent logging
- Add color support: ERROR (red), WARN (yellow), SUCCESS (green), INFO (normal)
- Colors only appear in terminal, plain text in log files
- Improve code organization and DRY principle
- Fix shellcheck spacing warnings in backup.sh
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
