feat: P0-6 Excel导入导出全套(客户/合同/库存/统计, 自动表头探测)

CHANGELOG

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 # CHANGELOG
 
+- [2026-09-25 14:50] FEAT: v2.25 P0-6 Excel 导入导出全套。①excel_service 扩展: read_rows 自动探测表头行(兼容首行标题合并格, 修复导入全跳过)/pick 中文列名取值/simple_table_workbook/statistics_workbook 双Sheet; ②客户: excel-template 模板/excel-in 批量导入(缺姓名行级报错)/excel-out 导出; ③合同 excel-out(含已收); ④库存 excel-out/excel-in(同名更新数量累加); ⑤reports/excel-statistics(订单汇总+收款统计); ⑥依赖补 python-multipart(UploadFile 必需, 缺失曾致后端启动失败); ⑦前端 apiUpload+四个页面导入导出按钮; 实测: 模板回传导入成功1条/库存导出→再导入更新1条; vue-tsc 0 错+构建通过 (Files: pyproject.toml, src/huamenchuang/services/excel_service.py, src/huamenchuang/api/customers.py, src/huamenchuang/api/contracts.py, src/huamenchuang/api/warehouse.py, src/huamenchuang/api/reports.py, frontend/src/api/index.ts, frontend/src/views/CustomersView.vue, frontend/src/views/WarehouseView.vue, frontend/src/views/ContractsView.vue, frontend/src/views/ReportView.vue, doc/API.md)
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 - [2026-09-25 13:50] FEAT: v2.24 P0-5 收款财务闭环。①ContractReceipt 模型(SK+日期+流水/方式五类/作废状态)+finance.py(账户 CRUD/登记收款/作废/流水分页/年度统计); ②GET /receipts/statistics(收款总额/合同应收/未收/12 月分布, 对齐 statistics_tb); ③合同列表注入 received/unreceived(当页一次 GROUP BY 聚合); ④新页面 /financial 财务管理(统计卡+月度柱图+流水+登记+账户管理)+路由菜单; 合同页加已收/未收列+收款按钮对话框; 修复 v-for 索引 m+1 类型; vue-tsc 0 错+构建通过; API 实测登记 3000→统计/列表联动正确 (Files: src/huamenchuang/models/business.py, src/huamenchuang/api/finance.py, src/huamenchuang/api/contracts.py, src/huamenchuang/api/router.py, frontend/src/views/FinancialView.vue, frontend/src/views/ContractsView.vue, frontend/src/views/LayoutView.vue, frontend/src/router/index.ts, doc/API.md)
 
 - [2026-09-25 13:00] FEAT: v2.23 P0-4 按库存优化+切割准备。①cut_solution 加 use_stock/stock_length 参数: use_stock=true 从仓库 profile 库存(单根长度>0)取原料 FFD 优化, 需求超库存输出 shortage 缺料清单(不拦截); 非库存模式 stock_length 可配; ②新增 preparation 切割准备/领料清单(按原料聚合根数/切割件数/余料)随方案保存; ③下料方案页加库存开关+标准长度输入+领料单表格+缺料清单+打印; vue-tsc 0 错+构建通过; API 实测合同3(15件/利用率87.4%/领料6米5根) (Files: src/huamenchuang/api/platform.py, frontend/src/views/CutSolutionView.vue, doc/API.md)