重新实现套餐相关功能

internal/db/models/user_plan_model_ext.go

@@ -1 +1,8 @@
 package models
+
+import timeutil "github.com/iwind/TeaGo/utils/time"
+
+// IsExpired 判断套餐是否过期
+func (this *UserPlan) IsExpired() bool {
+	return len(this.DayTo) == 0 || this.DayTo < timeutil.Format("Y-m-d")
+}