Slice #45: Port Pages CRUD Operations (put_page, delete_page, restore_page, purge_deleted_pages) #40

任务描述

移植 Pages CRUD operations：

• put_page: Insert or update a page
• delete_page: Soft delete a page
• restore_page: Restore a soft-deleted page
• purge_deleted_pages: Permanently purge all soft-deleted pages

验收标准

1. 每个 operation 实现 trait
2. 完整的参数验证
3. Trust boundary 检查（local_only）
4. 端到端 dispatch_json 测试
5. 与 TS JSON 输出格式一致

相关文件

• (reference)
• (implementation)
• (engine methods)