采购需求添加绑定物料

sql/requirement_add_material.sql

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+-- 采购需求关联物料库存（支持多物料，CSV）
+ALTER TABLE oa_requirements
+  ADD COLUMN material_ids VARCHAR(1000) DEFAULT NULL COMMENT '关联物料ID CSV -> sys_oa_warehouse.id' AFTER project_id;
+
+-- 已应用过单物料版本（material_id）的环境，执行下面这句把旧字段迁移并删除
+-- UPDATE oa_requirements SET material_ids = CAST(material_id AS CHAR) WHERE material_id IS NOT NULL AND (material_ids IS NULL OR material_ids = '');
+-- ALTER TABLE oa_requirements DROP COLUMN material_id;