Add documentation to clarify the 16MB zip size limit for plugin
marketplace submissions, along with practical recommendations:
- Compress static assets like images
- Clean up unnecessary files (.git, __pycache__, etc.)
- Optimize dependency sizes
- Use .gitattributes or release branches
Also mention the option to contact maintainers for manual bypass
when the limit cannot be met.
Co-authored-by: Seio <seio@astrbot.app>
