fix: goDiscoverCircles 跳转到 discover 首页（原路径 /pages/discover/circles 不存在）

cfc-frontend/pages/action/index.vue

@@ -415,7 +415,7 @@ export default {
       })
     },
     goDiscoverCircles: function() {
-      uni.navigateTo({ url: '/pages/discover/circles' })
+      uni.switchTab({ url: '/pages/discover/index' })
     },
     onFamilyMemberSelect: function(member) {
       this.selectedMemberId = member.id