fix: 修复星座查询前端日期类型问题

- picker返回的e.detail.value是字符串类型
- 使用parseInt转换为数字，避免字符串拼接导致月份错误
- 例如: '1' + 1 = '11' (错误), parseInt('1') + 1 = 2 (正确)

xuan-deduct-uniapp/src/pages/tool-xingzuo/tool-xingzuo.vue

@@ -75,10 +75,10 @@ export default {
   },
   methods: {
     onMonthChange(e) {
-      this.monthIndex = e.detail.value
+      this.monthIndex = parseInt(e.detail.value)
     },
     onDayChange(e) {
-      this.dayIndex = e.detail.value
+      this.dayIndex = parseInt(e.detail.value)
     },
     getXingZuoIcon(name) {
       const icons = {