Add Atari Jaguar CD support

[wizzomafizzo]

Summary

Add support for identifying Atari Jaguar CD games.

Background

The Atari Jaguar CD (1995) was a CD add-on for the Atari Jaguar. It uses standard CDs with a specific boot header format.

Technical Details

• Media type: Standard CD
• Filesystem: Custom (not standard ISO 9660)
• Detection signatures:
  • "ATRI" signature at specific offset in boot header
  • Boot header contains some metadata
• Game library: ~13 commercial releases (very limited)

Proposed ID Method

1. Detect "ATRI" signature in boot sector
2. Parse boot header for game metadata
3. Use header CRC/hash for unique identification

Implementation Notes

• Small game library (~13 games) simplifies database
• "ATRI" signature provides reliable detection
• Limited metadata in boot header
• May need custom sector reading (non-ISO9660)

Compatibility

• ✅ Readable by standard CD/DVD drives
• Low priority due to very small game library
• Moderate implementation effort (custom boot header parsing)

Challenges

• Very small game library (may not justify implementation effort)
• Limited documentation
• Custom disc format (not ISO 9660)