Add unit tests for PDF Packager converter functionality

- Implement tests for converter properties, ensuring correct input and output formats.
- Add tests for chip parsing, covering various image, pdf_image, and pdfa chip formats.
- Include tests for the isArchiveOutput and getOutputFileName functions.
- Mock execFile for testing the convert function, verifying command execution and output file creation.
- Ensure all chips are parseable and validate the completeness of chip categories.

LICENSE-OVERVIEW.md

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+# License Overview
+
+This project uses a **Mixed License / Source-Available** model.
+
+---
+
+## 📋 Quick Summary
+
+| Component Type           | License               | Commercial Use                   |
+| ------------------------ | --------------------- | -------------------------------- |
+| Upstream (from ConvertX) | AGPL-3.0              | ✅ Allowed (with source sharing) |
+| Author Original          | Custom Non-Commercial | ❌ Requires Permission           |
+
+---
+
+## 1. Upstream Components (AGPL-3.0)
+
+### What's Covered
+
+Core functionality derived from [C4illin/ConvertX](https://github.com/C4illin/ConvertX):
+
+- Base application architecture
+- Original converter integrations
+- Core API structure
+
+### Your Obligations
+
+Under AGPL-3.0, if you modify and deploy this software as a network service:
+
+1. ✅ You must make your modified source code available
+2. ✅ You must include the AGPL-3.0 license
+3. ✅ You must state your changes
+
+### Full License
+
+See [LICENSE](LICENSE) for the complete AGPL-3.0 text.
+
+---
+
+## 2. Author Original Components (Custom Non-Commercial)
+
+### What's Covered
+
+All original work created by the ConvertX-CN author:
+
+- 🌐 **i18n / Localization** - 65+ language translations
+- 🎨 **UI Enhancements** - Custom interface improvements
+- 📊 **PDF Translation** - PDFMathTranslate, BabelDOC integrations
+- 📄 **MinerU Integration** - PDF to Markdown conversion
+- 🔧 **New Converters** - Additional format support
+- 📚 **Documentation** - Chinese documentation
+- 🐳 **Docker Optimizations** - Multi-arch builds, CJK fonts
+
+### Permissions
+
+| Use Case                | Allowed?                 |
+| ----------------------- | ------------------------ |
+| Personal use            | ✅ Yes                   |
+| Educational use         | ✅ Yes                   |
+| Non-commercial research | ✅ Yes                   |
+| Commercial / SaaS       | ❌ No (requires license) |
+
+### Full License
+
+See [LICENSE-AUTHOR](LICENSE-AUTHOR) for the complete terms.
+
+---
+
+## 🤝 Commercial Licensing
+
+If you want to use ConvertX-CN in a commercial context:
+
+### Contact Methods
+
+1. **GitHub Issues**: https://github.com/pi-docket/ConvertX-CN/issues
+   - Create an issue with title: `[Commercial License Request]`
+
+2. **GitHub Discussions**: https://github.com/pi-docket/ConvertX-CN/discussions
+   - Start a discussion in the appropriate category
+
+3. **GitHub Profile**: https://github.com/pi-docket
+   - Check profile for additional contact information
+
+### What to Include
+
+When requesting a commercial license, please provide:
+
+- Company/Organization name
+- Intended use case
+- Expected scale of deployment
+- Contact information
+
+---
+
+## ❓ FAQ
+
+### Q: Can I self-host for my company's internal use?
+
+**A:** Internal use without external revenue generation is generally permitted.
+If unsure, please contact us.
+
+### Q: Can I offer this as a paid service?
+
+**A:** No. You need a commercial license for SaaS or paid services.
+
+### Q: Do I need to share my modifications?
+
+**A:** For AGPL-3.0 components: Yes, if you deploy as a network service.
+For author components: Depends on your license agreement.
+
+### Q: Can I fork and create my own version?
+
+**A:** Yes, but:
+
+- AGPL-3.0 components must remain AGPL-3.0
+- Author components cannot be used commercially without permission
+
+---
+
+## 📞 Contact
+
+- **GitHub**: [@pi-docket](https://github.com/pi-docket)
+- **Repository**: [ConvertX-CN](https://github.com/pi-docket/ConvertX-CN)
+- **Issues**: [Report Issues](https://github.com/pi-docket/ConvertX-CN/issues)
+- **Discussions**: [Community](https://github.com/pi-docket/ConvertX-CN/discussions)