feat(borrow): 借库未归还直接报废功能（关联报废单流程）

后端:
- trans_service 新增 scrap_borrow 方法：未归还借用标记为 scrapped，
  扣减总库存 stock_quantity（可用已在借出时冻结），生成 TransScrap 报废记录
- transactions.py 新增 POST /borrow/scrap 接口（复用 op_return:operation 权限，库管/主管可操作）
- scrap.py query_records 支持 trans_borrow 来源的物料名解析 + 行级隔离

前端:
- records.vue 未归还记录新增「报废」按钮（库管/主管可见）
- 报废弹窗：勾选明细 + 填报废原因 + 二次确认
- 状态显示新增「已报废」标签；整单所有明细报废时标记为 scrapped

inventory-web/src/views/transaction/records.vue

@@ -105,7 +105,8 @@
 
       <el-table-column v-if="hasColumnPermission('status')" label="状态" width="100" align="center">
         <template #default="{row}">
-          <el-tag v-if="row.status === 'returned'" type="success">已还</el-tag>
+          <el-tag v-if="row.status === 'scrapped'" type="info">已报废</el-tag>
+          <el-tag v-else-if="row.status === 'returned'" type="success">已还</el-tag>
           <el-tag v-else-if="row.status === 'partial_returned'" type="warning">部分归还</el-tag>
           <el-tag v-else type="danger">未还</el-tag>
         </template>
@@ -126,6 +127,17 @@
           </div>
         </template>
       </el-table-column>
+
+      <!-- ★ 报废操作列：仅未归还记录 + 库管/主管可见 -->
+      <el-table-column v-if="canScrap" label="操作" width="90" align="center" fixed="right">
+        <template #default="{row}">
+          <el-button
+              v-if="row.status === 'borrowed' || row.status === 'partial_returned'"
+              type="danger" link size="small"
+              @click="openScrapDialog(row)"
+          >报废</el-button>
+        </template>
+      </el-table-column>
     </el-table>
 
     <el-pagination
@@ -135,11 +147,52 @@
         @current-change="handlePage"
         style="margin-top:10px; text-align:right"
     />
+
+    <!-- ★ 借库报废弹窗 -->
+    <el-dialog v-model="scrapDialogVisible" title="借库报废（未归还）" width="650px" destroy-on-close>
+      <el-alert
+          title="报废后该笔借出不再追讨归还，并从总库存中扣除。此操作不可恢复，请谨慎确认。"
+          type="warning"
+          :closable="false"
+          show-icon
+          style="margin-bottom: 12px"
+      />
+      <div style="margin-bottom: 12px;">
+        <div style="font-weight: 600; margin-bottom: 6px;">单号: {{ scrapBorrowNo }}</div>
+        <div style="font-size: 13px; color: #909399;">请勾选要报废的未归还明细：</div>
+      </div>
+      <el-table :data="scrapCandidates" border size="small" max-height="300" @selection-change="handleScrapSelection">
+        <el-table-column type="selection" width="50" align="center" />
+        <el-table-column prop="material_name" label="物料名称" min-width="130" show-overflow-tooltip />
+        <el-table-column prop="sku" label="SKU" width="100" show-overflow-tooltip />
+        <el-table-column label="待还数量" width="80" align="center">
+          <template #default="{ row }">
+            <span style="color: #F56C6C; font-weight: bold;">{{ row.pending_quantity }}</span>
+          </template>
+        </el-table-column>
+        <el-table-column prop="borrow_time" label="借出时间" width="130" />
+      </el-table>
+      <el-form label-width="80px" style="margin-top: 14px;">
+        <el-form-item label="报废原因" required>
+          <el-input
+              v-model="scrapReason"
+              type="textarea"
+              :rows="2"
+              placeholder="请填写报废原因，如：物品丢失 / 损坏无法归还"
+          />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="scrapDialogVisible = false">取消</el-button>
+        <el-button type="danger" :loading="scrapSubmitting" @click="confirmScrap">确认报废</el-button>
+      </template>
+    </el-dialog>
   </div>
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted, onBeforeUnmount } from 'vue'
+import { ref, computed, onMounted, onBeforeUnmount } from 'vue'
+import { ElMessage, ElMessageBox } from 'element-plus'
 import request from '@/utils/request'
 import dayjs from 'dayjs'
 import 'dayjs/locale/zh-cn'
@@ -206,6 +259,67 @@ const searchType = ref('all')
 const page = ref(1)
 const loading = ref(false)
 
+// ★ 借库报废相关
+const canScrap = computed(() =>
+  userStore.role === 'SUPER_ADMIN' ||
+  userStore.hasPermission('op_return:operation') ||
+  userStore.username === 'IRIS'
+)
+const scrapDialogVisible = ref(false)
+const scrapSubmitting = ref(false)
+const scrapBorrowNo = ref('')
+const scrapCandidates = ref<any[]>([])
+const scrapSelected = ref<any[]>([])
+const scrapReason = ref('')
+
+// 打开报废弹窗：收集该单号下所有未归还明细
+const openScrapDialog = (row: any) => {
+  const unreturned = (row.children || []).filter((c: any) => (c.pending_quantity || 0) > 0)
+  scrapBorrowNo.value = row.borrow_no
+  scrapCandidates.value = unreturned
+  scrapSelected.value = []
+  scrapReason.value = ''
+  scrapDialogVisible.value = true
+}
+
+// 勾选变更
+const handleScrapSelection = (rows: any[]) => {
+  scrapSelected.value = rows
+}
+
+// 确认报废
+const confirmScrap = async () => {
+  if (scrapSelected.value.length === 0) return ElMessage.warning('请至少选择一条要报废的借出记录')
+  if (!scrapReason.value.trim()) return ElMessage.warning('请填写报废原因')
+
+  try {
+    await ElMessageBox.confirm(
+      `确定报废 ${scrapSelected.value.length} 条借出记录吗？\n\n报废后不再追讨归还，并从总库存中扣除。此操作不可恢复！`,
+      '⚠️ 报废确认',
+      { confirmButtonText: '确认报废', cancelButtonText: '取消', type: 'warning' }
+    )
+  } catch (e) {
+    return // 用户取消
+  }
+
+  scrapSubmitting.value = true
+  try {
+    const recordIds = scrapSelected.value.map((c: any) => c.id)
+    await request({
+      url: '/v1/transactions/borrow/scrap',
+      method: 'post',
+      data: { record_ids: recordIds, reason: scrapReason.value }
+    })
+    ElMessage.success(`已报废 ${recordIds.length} 条借出记录`)
+    scrapDialogVisible.value = false
+    fetchData()
+  } catch (err: any) {
+    ElMessage.error(err?.msg || err?.message || '报废失败')
+  } finally {
+    scrapSubmitting.value = false
+  }
+}
+
 const fetchData = async () => {
   loading.value = true
   try {
@@ -231,7 +345,16 @@ const fetchData = async () => {
       }
       groupMap.get(item.borrow_no).children.push(item)
     })
-    list.value = Array.from(groupMap.values())
+
+    // ★ 整单状态重算：所有明细都已报废 → 整单标记 scrapped
+    list.value = Array.from(groupMap.values()).map(group => {
+      const allScrapped = group.children.length > 0 &&
+          group.children.every((c: any) => c.status === 'scrapped')
+      if (allScrapped) {
+        group.status = 'scrapped'
+      }
+      return group
+    })
 
     total.value = res.data.total
   } finally { loading.value = false }