docs: 添加详细实施计划

包含 4 个阶段 20+ 个任务:
- 阶段1: MySQL 数据库迁移 (7 tasks)
- 阶段2: 用户权限增强 (3 tasks)
- 阶段3: H5 移动端适配 (12 tasks)
- 阶段4: 测试验证 (2 tasks)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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2026-01-23 17:35:37 +08:00
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