feat(wms/coil/info): 新增钢卷成本信息展示模块

新增囤积成本、囤积天数、钢卷净重的展示卡片，计算并展示钢卷的囤积成本，通过入库时间计算实际囤积天数，优化页面数据展示维度

klp-ui/src/views/wms/coil/info.vue

@@ -11,6 +11,27 @@
         </div>
       </div>
 
+      <div class="section basic-info-section">
+        <div class="section-header">
+          <span class="section-icon">💰</span>
+          <span class="section-title">成本信息</span>
+        </div>
+        <div class="section-body">
+          <el-descriptions :column="3" border size="small">
+            <el-descriptions-item label="囤积成本"> 
+              <span class="cost-value">{{ hoardingCost }}</span>
+              <span class="cost-unit">t·天</span>
+            </el-descriptions-item>
+            <el-descriptions-item label="囤积天数">
+              <span>{{ hoardingDays }} 天</span>
+            </el-descriptions-item>
+            <el-descriptions-item label="钢卷净重">
+              <span>{{ coilInfo.netWeight || 0 }} t</span>
+            </el-descriptions-item>
+          </el-descriptions>
+        </div>
+      </div>
+
       <div class="section trace-section">
         <div class="section-header">
           <span class="section-icon">🔄</span>
@@ -1218,12 +1239,24 @@ export default {
     salesInfo() {
       return this.coilInfo.orderList?.[0] || {};
     },
-    // 判断是否为冷硬卷
     isColdHardCoil() {
       return this.coilInfo.itemName && this.coilInfo.itemName.includes('冷硬卷');
     },
     hasPerfData() {
       return this.perfSeries && this.perfSegCount > 0;
+    },
+    hoardingDays() {
+      const inboundTime = this.getInboundTime();
+      if (!inboundTime) return 0;
+      const inboundDate = new Date(inboundTime);
+      const today = new Date();
+      const diffTime = today.getTime() - inboundDate.getTime();
+      const diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));
+      return Math.max(0, diffDays);
+    },
+    hoardingCost() {
+      const netWeight = parseFloat(this.coilInfo.netWeight) || 0;
+      return (this.hoardingDays * netWeight).toFixed(2);
     }
   },
   async created() {
@@ -1367,6 +1400,18 @@ export default {
         this.$set(this.inspectionItemLoadingMap, taskId, false);
       }
     },
+    getInboundTime() {
+      if (!this.traceResult || !this.traceResult.steps) {
+        return this.coilInfo.createTime || null;
+      }
+      const createStep = this.traceResult.steps.find(step => 
+        step.action === '新增' || step.action === '创建'
+      );
+      if (createStep) {
+        return createStep.create_time || createStep.update_time || createStep.time;
+      }
+      return this.coilInfo.createTime || null;
+    },
     formatTime(timeStamp) {
       if (!timeStamp) return '-';
       const date = new Date(timeStamp);
@@ -3332,4 +3377,17 @@ export default {
   color: #c0c4cc;
   font-size: 13px;
 }
+
+.cost-value {
+  font-size: 20px;
+  font-weight: 700;
+  color: #d97706;
+  text-shadow: 0 0 8px rgba(217, 119, 6, 0.4);
+}
+
+.cost-unit {
+  font-size: 12px;
+  color: #64748b;
+  margin-left: 4px;
+}
 </style>