Replaces the strict >1,000,000/<20,000,000 range with an inclusive
>=10,000/<=20,000,000 range, matching the actual usable range confirmed
on the real Sổ Bán Lẻ catalog after the earlier per-line-qty fix.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017KPzWwuTEeX2vXGXvyGn4q