feat: add comprehensive image generation tests and fix CI issues

- Add complete test coverage for image generation, editing, and variation
- Fix Buffer/File format issues in tests using proper File objects
- Remove problematic postinstall script that caused CI failures
- Tests now verify span creation, attributes, and token calculation
- Support for different quality levels (low/medium/high) validation

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

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

Author: nirga

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