fix: 补充缺失的default-avatar.png，统一路径

cfc-frontend/components/FamilyMemberCard.vue

@@ -21,7 +21,7 @@ export default {
   },
   computed: {
     defaultAvatar: function() {
-      return '/static/images/default-avatar.png'
+      return '/static/default-avatar.png'
     },
     roleBadgeColor: function() {
       var role = this.member && (this.member.effectiveRole || this.member.memberType)