feat: BOM型号可编辑 + 生产订单BOM去括号 + 物料明细各工厂实时库存

- BOM编辑页「型号」输入框取消 readonly，可修改；bom_edit 增加非空与唯一校验（重复提示「BOM 型号已存在」、空值提示「BOM 型号必填」），改名不影响关联生产订单与流水
- 生产订单列表/详情/表单中 BOM 显示由 CODE (NAME) 改为 CODE · NAME，去掉括号
- 物料明细页新增「各工厂实时库存」表（工厂编号/名称/实时库存），显示每个工厂的实时聚合库存（入−出），不受顶栏工厂过滤影响

app.py

@@ -831,11 +831,21 @@ def material_detail(mid):
         stmt_out.order_by(Outbound.occur_date.desc(), Outbound.id.desc())
     ).all()
     fmap = {f.id: f.name for f in db.session.scalars(db.select(Factory)).all()}
+    # 各工厂实时库存(按工厂拆分, 实时聚合 inbound-outbound)
+    inb_by_f = {r[0]: float(r[1]) for r in db.session.execute(
+        db.text("SELECT factory_id, COALESCE(SUM(qty),0) FROM inbound WHERE material_id=:mid GROUP BY factory_id"),
+        {"mid": mid}).fetchall()}
+    out_by_f = {r[0]: float(r[1]) for r in db.session.execute(
+        db.text("SELECT factory_id, COALESCE(SUM(qty),0) FROM outbound WHERE material_id=:mid GROUP BY factory_id"),
+        {"mid": mid}).fetchall()}
+    per_factory = [{"f": f, "stock": inb_by_f.get(f.id, 0) - out_by_f.get(f.id, 0)}
+                   for f in db.session.scalars(db.select(Factory).order_by(Factory.code)).all()]
     return render_template("material_detail.html", m=m,
                            stock=sm.get(m.id, 0),
                            inb_total=inb_total.get(m.id, 0),
                            out_total=out_total.get(m.id, 0),
-                           inbounds=inbounds, outbounds=outbounds, fmap=fmap)
+                           inbounds=inbounds, outbounds=outbounds, fmap=fmap,
+                           per_factory=per_factory)
 
 
 # ---------------- 入库 / 出库 ----------------
@@ -1366,8 +1376,21 @@ def bom_edit(bid):
         return redirect(url_for("boms"))
     mats = db.session.scalars(db.select(Material).order_by(Material.part_number)).all()
     if request.method == "POST":
+        # BOM 型号(简码)可编辑: 校验非空 + 不与其它 BOM 重复
+        new_code = request.form.get("code", "").strip()
         b.name = request.form.get("name", "")
         b.note = request.form.get("note", "")
+        raw = db.session.scalars(db.select(BomItem).where(BomItem.bom_id == b.id)).all()
+        items = [{"pn": db.session.get(Material, it.material_id).part_number,
+                  "qty": it.qty_per_unit} for it in raw]
+        if not new_code:
+            flash("BOM 型号必填", "error")
+            return render_template("bom_form.html", b=b, mats=mats, items=items, form_code=new_code)
+        dup = db.session.scalar(db.select(Bom).where(Bom.code == new_code, Bom.id != b.id))
+        if dup:
+            flash("BOM 型号已存在", "error")
+            return render_template("bom_form.html", b=b, mats=mats, items=items, form_code=new_code)
+        b.code = new_code
         db.session.execute(db.delete(BomItem).where(BomItem.bom_id == b.id))
         pns = request.form.getlist("pn")
         qts = request.form.getlist("qty")