feat: 生产订单新增导出 Excel 与打印功能

- 订单列表页「导出 Excel」(/orders/export): 导出全部生产订单(订单号/BOM/接单量/工厂/状态/经手人/下单时间/备注)

- 订单详情页「导出 Excel」(/order/<id>/export): 导出派工单, 含「订单信息」+「领料明细」双 sheet

- 订单详情页「打印」按钮: window.print() + @media print 样式(隐藏导航/按钮, 输入框转纯文本, 隐藏提示), 输出干净派工单

excel_io.py

@@ -327,6 +327,99 @@ def export_ledger(target, rows):
     wb.save(target)
 
 
+def export_orders(target, data):
+    """导出生产订单列表。
+
+    data: [{o, bom, factory}] (与 orders() 返回一致)。
+    """
+    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"]
+    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"]
+        fac = d["factory"]
+        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,
+            (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 "",
+        ])
+        if o.status == "picked":
+            ws.cell(row=ws.max_row, column=6).fill = PatternFill("solid", fgColor="C6EFCE")
+        else:
+            ws.cell(row=ws.max_row, column=6).fill = PatternFill("solid", fgColor="FFE699")
+    ws.freeze_panes = "A2"
+    wb.save(target)
+
+
+def export_order_detail(target, o, bom, 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。"""
+    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)
+    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),
+        ("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 ""),
+        ("状态", "已领料" if o.status == "picked" else "待领料"),
+        ("备注", o.remark or "-"),
+        ("调入总览", f"已调入 {posted_count} 项 / 合计 {posted_total} 件；计划调入合计 {planned_total} 件"),
+    ]
+    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)
+        r += 1
+
+    ws2 = 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]:
+        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([
+            x["m"].part_number,
+            x["m"].manufacturer or "-",
+            round(x["have"], 3),
+            round(x["need"], 3),
+            round(x["gap"], 3),
+            round(x["alloc"], 3),
+            "缺料" if x["short"] else "充足",
+            round(x["gap"] + x["alloc"], 3),
+            subs,
+        ])
+        if x["short"]:
+            ws2.cell(row=ws2.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"
+    wb.save(target)
+
+
 def build_bom_template(path):
     """生成与真实 BOM 模板一致的格式(Altium/嘉立创导出):
     每个 worksheet 一个 BOM, sheet 名即 BOM 型号; 列头 Item/Part Number/