Create 3 schema files for the production module:
- production_work_order.py: work order base, list query, complete
- production_task.py: task CRUD, steps, materials, outputs, inputs
- cell_product.py: cell product create, update, list query
Create docs/sql/production_work_order.sql with:
- 10 CREATE TABLE IF NOT EXISTS statements for production work order module
- 3 sys_menu INSERT statements under 生产管理 parent menu
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