fix: add write permission to QA buttons and decouple inbound/print quantities

inventory-web/src/views/stock/inbound/buy.vue

@@ -1299,13 +1299,8 @@ watch(() => [form.in_quantity, form.unit_price], () => {
   }
 })
 
-// 联动优化：当入库数量变化时，自动同步打印份数（除非用户已手动修改过）
-watch(() => form.in_quantity, (newQty) => {
-  if (dialogStatus.value === 'create' && newQty && newQty > 0) {
-    // 仅在创建模式下自动同步
-    form.print_copies = newQty
-  }
-})
+// 注意：入库数量和打印份数现在是独立的字段，不再自动同步
+// 用户可以单独设置打印份数，与入库数量无关
 
 const fetchData = async () => {
   loading.value = true