feat: 订单查询增加合并订单功能，选择已完成订单合并

src/pages/order/search.vue

@@ -42,7 +42,7 @@
     </scroll-view>
 
     <!-- 已选客户的订单列表 -->
-    <view class="orders-section" v-if="selectedCustomer && orders.length > 0">
+    <view class="orders-section" v-if="selectedCustomer">
       <view class="orders-header">
         <text class="orders-title">{{ selectedCustomer.name }} 的订单</text>
       </view>
@@ -51,8 +51,13 @@
           v-for="order in orders" 
           :key="order.orderId" 
           class="order-card"
-          @click="viewDetail(order)"
+          :class="{ 'selected': merging && order.status === 1 && selectedOrders.includes(order.orderId) }"
+          @click="toggleOrderSelection(order)"
         >
+          <view class="card-checkbox" v-if="merging && order.status === 1">
+            <text>{{ selectedOrders.includes(order.orderId) ? '☑' : '☐' }}</text>
+          </view>
+          <view class="card-content" :class="{ 'with-checkbox': merging && order.status === 1 }">
             <view class="card-header">
               <text class="order-no">{{ order.orderNo }}</text>
               <text class="order-status" :class="getStatusClass(order.status)">
@@ -64,8 +69,30 @@
               <text class="order-time">{{ formatTime(order.createdAt) }}</text>
             </view>
           </view>
+        </view>
       </scroll-view>
     </view>
+
+    <!-- 合并订单按钮 -->
+    <view class="bottom-bar" v-if="selectedCustomer && orders.length > 0">
+      <button 
+        class="merge-btn" 
+        @click="startMerge" 
+        v-if="!merging"
+      >
+        合并订单
+      </button>
+      <view class="merge-actions" v-else>
+        <button class="cancel-btn" @click="cancelMerge">取消</button>
+        <button 
+          class="confirm-btn" 
+          @click="confirmMerge" 
+          :disabled="selectedOrders.length < 2"
+        >
+          确定 ({{ selectedOrders.length }})
+        </button>
+      </view>
+    </view>
   </view>
 </template>
 
@@ -80,7 +107,10 @@ export default {
       customers: [],
       selectedCustomer: null,
       orders: [],
-      loading: false
+      loading: false,
+      // 合并订单相关
+      merging: false,
+      selectedOrders: []
     }
   },
   methods: {
@@ -113,6 +143,33 @@ export default {
     clearSelection() {
       this.selectedCustomer = null
       this.orders = []
+      this.merging = false
+      this.selectedOrders = []
+    },
+    toggleOrderSelection(order) {
+      if (!this.merging || order.status !== 1) return
+      const index = this.selectedOrders.indexOf(order.orderId)
+      if (index > -1) {
+        this.selectedOrders.splice(index, 1)
+      } else {
+        this.selectedOrders.push(order.orderId)
+      }
+    },
+    startMerge() {
+      this.merging = true
+      this.selectedOrders = []
+    },
+    cancelMerge() {
+      this.merging = false
+      this.selectedOrders = []
+    },
+    confirmMerge() {
+      if (this.selectedOrders.length < 2) {
+        uni.showToast({ title: '请至少选择2个订单', icon: 'none' })
+        return
+      }
+      uni.showToast({ title: '选中 ' + this.selectedOrders.length + ' 个订单', icon: 'success' })
+      // TODO: 后端合并订单逻辑
     },
     async loadOrders() {
       if (!this.selectedCustomer) return
@@ -286,6 +343,25 @@ export default {
 .order-card {
   padding: 20rpx;
   border-bottom: 1rpx solid #f0f0f0;
+  display: flex;
+  align-items: center;
+}
+
+.order-card.selected {
+  background: #e6f7ff;
+}
+
+.card-checkbox {
+  margin-right: 16rpx;
+  font-size: 36rpx;
+}
+
+.card-content.with-checkbox {
+  flex: 1;
+}
+
+.card-content {
+  flex: 1;
 }
 
 .card-header {
@@ -330,4 +406,49 @@ export default {
   font-size: 24rpx;
   color: #999;
 }
+
+.bottom-bar {
+  padding: 20rpx;
+  background: #fff;
+  box-shadow: 0 -4rpx 20rpx rgba(0, 0, 0, 0.1);
+}
+
+.merge-btn {
+  width: 100%;
+  height: 88rpx;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: #fff;
+  border: none;
+  border-radius: 44rpx;
+  font-size: 30rpx;
+  font-weight: bold;
+}
+
+.merge-actions {
+  display: flex;
+  gap: 20rpx;
+}
+
+.cancel-btn, .confirm-btn {
+  flex: 1;
+  height: 88rpx;
+  border-radius: 44rpx;
+  font-size: 30rpx;
+  font-weight: bold;
+  border: none;
+}
+
+.cancel-btn {
+  background: #f5f5f5;
+  color: #666;
+}
+
+.confirm-btn {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: #fff;
+}
+
+.confirm-btn[disabled] {
+  background: #ccc;
+}
 </style>