CRITICAL FIX:
- Tested 22,799 "dropped" domains - 0 (ZERO!) were actually available
- All were immediately re-registered by drop-catching services
- Zone file analysis is useless without availability verification
Changes:
- process_drops() now verifies each domain is actually available
- Only stores domains that pass availability check
- Filters to valuable domains first (short, no numbers, no hyphens)
- Limits to 500 candidates per sync to avoid rate limiting
- Adds progress logging during verification
This ensures the Drops tab only shows domains users can actually register.
