Re-init eb_agent_level (4 tiers: 普通会员/业务主管/业务经理/业务总监)
and eb_agent_level_task (3 upgrade tasks: 直推 3 / 团队 30 单 / 团队
100 单) based on docs/project-shaoyaoju/prd-require.md §7.2.
TRUNCATE-based; orphan cleanup of eb_agent_level_task_record left
commented for the operator to opt in.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
