feat: Migrate old events and gallery images to persistent storage

- Add migration script to convert and copy images
- Include 7 events (Karaoke, Pub Quiz, etc.) in WebP format
- Include 9 gallery images in WebP format
- Update .gitignore to allow images in data/images/
- Add migration documentation in MIGRATION_README.md

Images are stored in backend/data/images/ which maps to
the persistent Fly.io volume at /app/data/
This commit is contained in:
2025-12-09 16:41:57 +01:00
parent db3a38ed45
commit 1120472af8
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