协调L3页面，新增合同证书的文件上传逻辑

klp-ui/src/views/hrm/payroll/index.vue

@@ -328,6 +328,13 @@ export default {
       }
     }
   },
+  computed: {
+    latestStatDate() {
+      const dates = (this.statList || []).map(i => i.statDate).filter(Boolean)
+      if (!dates.length) return ''
+      return dates.sort().pop()
+    }
+  },
   created() {
     this.loadPayPlan()
     this.loadPayRun()