refactor(outpatientCharging): 优化结算逻辑和诊断代码处理

- 将 zhenduan 变量从 disease_code 改为 chronic_code
- 在医保预结算时，根据 man_name 的值清空 zhenduan

src/views/jiesuan/outpatientCharging.vue

@@ -2258,7 +2258,7 @@ export default {
                 }
             }
             this.isGS = this.selectTableArr[0]?.settle_type.is_gs
-            this.zhenduan = this.selectTableArr[0]?.disease_code
+            this.zhenduan = this.selectTableArr[0]?.chronic_code
         },
         // 结算类型赋默认值
         setPersonType(e) {
@@ -2404,6 +2404,9 @@ export default {
         },
         // 医保预结算
         selectCardYiboPre(data, x, y, zhenduan) {
+            if (this.man_name=='2' || this.man_name=='3' || this.man_name=='1') {
+                zhenduan=''
+            }
             this.yujiesuanLoading = true
             this.xj_amount = 0
             this.source_pay_amount = 0