Creates migrate_all_cards_to_s3.py to migrate historical card images from
Paper Dynasty API to S3 bucket. Key features:
- Processes all cardsets automatically (12,966 player cards across 29 cardsets)
- Detects and skips URLs already pointing to AWS S3
- Dry-run mode for previewing changes before execution
- Flexible filtering by cardset ID ranges or exclusion lists
- Per-cardset and global statistics tracking
- Updates player records with new S3 URLs after upload
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
