说明 / Notes · 数据自动写入本地浏览器存储（localStorage，key：sales_mpw_v1）。
"重置"按钮可恢复本次导入的初始 SEED。"替换"会清空当前所有已编辑的付款；"合并"按项目号匹配，未匹配的新增，匹配的更新售价等基础字段但保留已付分期数据。 / "Reset" restores the initial SEED of this import. "Replace" clears all current payment edits; "Merge" matches by Project No (adds unmatched, updates base fields but keeps paid installments).