feat: 生产订单支持一次多选 BOM 且各 BOM 独立设置生产数量

- 新增中间表 prod_order_bom(order_id, bom_id, qty)，一个订单可挂多个 BOM，每个 BOM 单独设生产数量
- prod_order.qty 改为各 BOM 数量汇总，bom_id 仅作主 BOM 冗余摘要
- 物料需求按 Σ(BOM 单套用量 × 各自生产数量) 跨 BOM 合并聚合，覆盖详情/领料/调入/导出
- 订单表单改为动态多行(BOM 下拉 + 数量输入 + 删除行)，列表与导出展示「BOM清单(型号×数量)」
- 导出 Excel 增至 3 个 sheet：订单信息 / BOM清单 / 领料明细
- 修复 _parse_bom_pairs 表单字段名 bom_id[]/qty[] 解析；order_delete 一并级联删除 prod_order_bom
- build_exe.py 增加构建后自动拷贝 dist_pkg→dist（EXE 同目录即数据库所在）

Co-Authored-By: WorkBuddy <workbuddy@tencent.com>

excel_io.py

@@ -330,53 +330,62 @@ def export_ledger(target, rows):
 def export_orders(target, data):
     """导出生产订单列表。
 
-    data: [{o, bom, factory}] (与 orders() 返回一致)。
+    data: [{o, lines, factory, total}] (与 orders() 返回一致)。
+    lines: [(Bom, qty)] 该订单的 BOM 行(可多个)。
     """
     wb = Workbook()
     ws = wb.active
     ws.title = "生产订单"
-    head = ["订单号", "BOM型号", "BOM名称", "接单量", "生产工厂", "状态",
-            "经手人", "下单时间", "备注"]
+    head = ["订单号", "BOM清单(型号×数量)", "生产工厂", "状态",
+            "经手人", "下单时间", "备注", "总接单量"]
     ws.append(head)
     for c in ws[1]:
         c.font = Font(bold=True)
         c.fill = PatternFill("solid", fgColor="DDEBF7")
     for d in data:
         o = d["o"]
-        bom = d["bom"]
+        lines = d.get("lines") or []
         fac = d["factory"]
+        total = d.get("total") or 0
+        bom_info = "\n".join(
+            f"{b.code}{('·' + b.name) if b.name else ''}×{q}" for b, q in lines) or "—"
         status = "已领料" if o.status == "picked" else "待领料"
         ws.append([
             o.order_no,
-            bom.code if bom else "",
-            bom.name if bom else "",
-            o.qty,
+            bom_info,
             (f"{fac.code}·{fac.name}" if fac else "未指定"),
             status,
             o.operator or "",
             o.created_at.strftime("%Y-%m-%d %H:%M") if o.created_at else "",
             o.remark or "",
+            total,
         ])
         if o.status == "picked":
-            ws.cell(row=ws.max_row, column=6).fill = PatternFill("solid", fgColor="C6EFCE")
+            ws.cell(row=ws.max_row, column=4).fill = PatternFill("solid", fgColor="C6EFCE")
         else:
-            ws.cell(row=ws.max_row, column=6).fill = PatternFill("solid", fgColor="FFE699")
+            ws.cell(row=ws.max_row, column=4).fill = PatternFill("solid", fgColor="FFE699")
+        ws.cell(row=ws.max_row, column=2).alignment = Alignment(wrap_text=True, vertical="top")
     ws.freeze_panes = "A2"
     wb.save(target)
 
 
-def export_order_detail(target, o, bom, reqs, factory,
+def export_order_detail(target, o, lines, reqs, factory,
                         posted_total, planned_total, posted_count):
-    """导出单个生产订单详情(派工单)：订单信息 sheet + 领料明细 sheet。"""
+    """导出单个生产订单详情(派工单)：订单信息 sheet + BOM清单 sheet + 领料明细 sheet。
+
+    lines: [(Bom, qty)] 该订单的 BOM 行(可多个); 领料明细已按全部 BOM 汇总。
+    """
     wb = Workbook()
     ws = wb.active
     ws.title = "订单信息"
     ws.append(["生产订单派工单"])
     ws["A1"].font = Font(bold=True, size=14)
+    total_qty = sum(q for _, q in (lines or []))
     info = [
         ("订单号", o.order_no),
-        ("BOM型号", (bom.code if bom else "-") + (f" · {bom.name}" if bom and bom.name else "")),
-        ("接单量", o.qty),
+        ("BOM清单", "\n".join(
+            f"{b.code}{('·' + b.name) if b.name else ''}×{q}" for b, q in (lines or [])) or "-"),
+        ("总接单量", total_qty),
         ("生产工厂", (f"{factory.code}·{factory.name}" if factory else "未指定（按汇总库存）")),
         ("经手人", o.operator or "-"),
         ("下单时间", o.created_at.strftime("%Y-%m-%d %H:%M") if o.created_at else ""),
@@ -387,21 +396,32 @@ def export_order_detail(target, o, bom, reqs, factory,
     r = 3
     for k, v in info:
         ws.cell(row=r, column=1, value=k).font = Font(bold=True)
-        ws.cell(row=r, column=2, value=v)
+        cell = ws.cell(row=r, column=2, value=v)
+        if k == "BOM清单":
+            cell.alignment = Alignment(wrap_text=True, vertical="top")
         r += 1
 
-    ws2 = wb.create_sheet("领料明细")
+    ws2 = wb.create_sheet("BOM清单")
+    ws2.append(["BOM型号", "BOM名称", "生产数量"])
+    for c in ws2[1]:
+        c.font = Font(bold=True)
+        c.fill = PatternFill("solid", fgColor="DDEBF7")
+    for b, q in (lines or []):
+        ws2.append([b.code, b.name or "", q])
+    ws2.freeze_panes = "A2"
+
+    ws3 = wb.create_sheet("领料明细")
     head = ["物料编号", "型号", "下单前库存", "需求数量", "缺口",
             "调入数量", "状态", "工厂库存", "可替代料"]
-    ws2.append(head)
-    for c in ws2[1]:
+    ws3.append(head)
+    for c in ws3[1]:
         c.font = Font(bold=True)
         c.fill = PatternFill("solid", fgColor="DDEBF7")
     for x in reqs:
         subs = "、".join(
             f"{s['pn']}·{s['stock']}{'✓' if s['available'] else '✗'}" for s in x["subs"]
         ) if x["subs"] else "—"
-        ws2.append([
+        ws3.append([
             x["m"].part_number,
             x["m"].manufacturer or "-",
             round(x["have"], 3),
@@ -413,10 +433,10 @@ def export_order_detail(target, o, bom, reqs, factory,
             subs,
         ])
         if x["short"]:
-            ws2.cell(row=ws2.max_row, column=7).fill = PatternFill("solid", fgColor="FFC7CE")
+            ws3.cell(row=ws3.max_row, column=7).fill = PatternFill("solid", fgColor="FFC7CE")
         else:
-            ws2.cell(row=ws2.max_row, column=7).fill = PatternFill("solid", fgColor="C6EFCE")
-    ws2.freeze_panes = "A2"
+            ws3.cell(row=ws3.max_row, column=7).fill = PatternFill("solid", fgColor="C6EFCE")
+    ws3.freeze_panes = "A2"
     wb.save(target)