fix(warehouse): add forecast quantity input hint

src/modules/overseas-warehouse/views/WarehouseServiceView.vue

@@ -1836,7 +1836,7 @@ function addReturnBoxBinding(source: RelabelInventoryCandidate) {
         <div class="warehouse-section-heading warehouse-transfer-receipt-heading"><h3>预报箱唛（{{ selectedDetail?.packageCount || 0 }} 箱）</h3><div class="warehouse-transfer-receipt-actions"><el-button v-if="canIncreaseForecast" type="primary" size="small" @click="openIncreaseForecast"><Plus :size="14" />增加预报箱数</el-button><el-button type="primary" size="small" @click="printTransferCartons(String(selectedDetail?.transferNo || ''))"><Printer :size="14" />打印预报箱唛</el-button><el-button size="small" @click="showForecastCartons = true">查看预报箱唛</el-button></div></div>
         <el-dialog v-model="showForecastCartons" title="预报箱唛明细" width="900px" align-center destroy-on-close append-to-body><el-table :data="selectedDetail?.cartons || []" size="small" border><el-table-column prop="cartonMark" label="仓库唛头" min-width="300" /><el-table-column label="预报SKU" min-width="240"><template #default="{ row }">{{ selectedDetail?.items?.find(item => String(item.id) === String(row.transferItemId))?.skuCode || '—' }}</template></el-table-column><el-table-column label="清点状态" width="130"><template #default="{ row }">{{ row.status === 'COUNTED' ? '已清点' : row.status === 'NOT_RECEIVED' ? '未收到' : '待清点' }}</template></el-table-column></el-table><template #footer><el-button @click="showForecastCartons = false">关闭</el-button></template></el-dialog>
         <el-dialog v-model="increaseForecastOpen" title="增加预报箱数" width="560px" align-center destroy-on-close append-to-body :close-on-click-modal="!increasingForecast" :show-close="!increasingForecast">
-          <el-form label-width="110px"><el-form-item label="预报SKU"><el-select v-model="increaseForecastForm.itemId" :disabled="increasingForecast" style="width:100%"><el-option v-for="item in forecastSnapshot?.items || []" :key="String(item.id)" :value="String(item.id)" :label="item.skuCode || item.productNameZh || '未命名SKU'" /></el-select></el-form-item><el-form-item label="新增箱数"><el-input-number v-model="increaseForecastForm.additionalCount" :disabled="increasingForecast" :min="1" :max="Math.max(1, 5000 - Number(forecastSnapshot?.packageCount || 0))" :precision="0" /></el-form-item></el-form><p class="warehouse-form-hint">保留原箱唛，仅补生成新增箱唛；SKU预报件数保持不变。</p>
+          <el-form label-width="110px"><el-form-item label="预报SKU"><el-select v-model="increaseForecastForm.itemId" :disabled="increasingForecast" style="width:100%"><el-option v-for="item in forecastSnapshot?.items || []" :key="String(item.id)" :value="String(item.id)" :label="item.skuCode || item.productNameZh || '未命名SKU'" /></el-select></el-form-item><el-form-item label="新增箱数"><el-input-number v-model="increaseForecastForm.additionalCount" placeholder="请输入新增箱数" :disabled="increasingForecast" :min="1" :max="Math.max(1, 5000 - Number(forecastSnapshot?.packageCount || 0))" :precision="0" /></el-form-item></el-form><p class="warehouse-form-hint">保留原箱唛，仅补生成新增箱唛；SKU预报件数保持不变。</p>
           <template #footer><el-button :disabled="increasingForecast" @click="increaseForecastOpen = false">取消</el-button><el-button type="primary" :loading="increasingForecast" @click="saveIncreaseForecast">确认增加</el-button></template>
         </el-dialog>
       </div>