refactor(销售时间线): 优化客户数据管理和展示逻辑

重构销售时间线组件，分离不同阶段的客户数据管理：
1. 不再将后三个阶段和成交阶段的客户合并到customersList
2. 为各阶段客户数据添加独立处理逻辑
3. 优化课程显示逻辑，优先使用class_num字段
4. 简化总数计算逻辑

my-vue-app/src/views/person/sale.vue

@@ -324,7 +324,6 @@ async function getTimeline() {
           value: parseInt(count) || 0
         }))
       }
-      
       // 处理客户列表数据
       if (res.data.all_customers_list) {
         customersList.value = res.data.all_customers_list
@@ -409,15 +408,7 @@ async function getTimeline() {
           pay_status: customer.pay_status
         })
         
-        // 将后三个阶段的客户添加到customersList中
-        const additionalCustomers = [
-          ...unpaidCustomers.map(customer => formatCustomerForList(customer, '点击未支付')),
-          ...depositCustomers.map(customer => formatCustomerForList(customer, '付定金')),
-          ...conversionCustomers.map(customer => formatCustomerForList(customer, '定金转化'))
-        ]
-        
-        // 合并到现有的customersList中
-        customersList.value = [...customersList.value, ...additionalCustomers]
+        // 后三个阶段的客户数据已存储在courseCustomers['课1-4']中，不需要合并到customersList
         
 
       }
@@ -435,21 +426,7 @@ async function getTimeline() {
         payMoneyCustomersCount.value = payRes.data.pay_money_customers_count
       }
       
-      // 将成交阶段客户添加到总的客户列表中
-      if (payRes.data.pay_money_customers_list) {
-        const payMoneyCustomers = payRes.data.pay_money_customers_list.map(customer => ({
-          customer_name: customer.customer_name,
-          phone: customer.phone,
-          customer_occupation: customer.customer_occupation,
-          customer_child_education: customer.customer_child_education,
-          latest_message_time: customer.latest_message_time,
-          customer_avatar_url: customer.customer_avatar_url,
-          type: '成交'
-        }))
-        
-        // 合并到现有的customersList中
-        customersList.value = [...customersList.value, ...payMoneyCustomers]
-      }
+      // 成交阶段客户数据已存储在payMoneyCustomersList中，不需要合并到customersList
     }
   } catch (error) {
     console.error('获取时间线数据失败:', error)
@@ -519,7 +496,6 @@ const formattedCustomersList = computed(() => {
     lastMessageTime: customer.latest_message_time,
     avatarUrl: customer.customer_avatar_url,
     type: customer.type,
-    classNum: customer.class_num,
     class_num: customer.class_num, // 确保字段名一致
     // 添加一些默认值以兼容现有组件
     salesStage: customer.type || '待联系',