feat(payment): add complete payment system with multi-provider support

Add a full payment and subscription system supporting EasyPay (Alipay/WeChat),
Stripe, and direct Alipay/WeChat Pay providers with multi-instance load balancing.

backend/ent/user/user.go

@@ -61,6 +61,8 @@ const (
 	EdgeAttributeValues = "attribute_values"
 	// EdgePromoCodeUsages holds the string denoting the promo_code_usages edge name in mutations.
 	EdgePromoCodeUsages = "promo_code_usages"
+	// EdgePaymentOrders holds the string denoting the payment_orders edge name in mutations.
+	EdgePaymentOrders = "payment_orders"
 	// EdgeUserAllowedGroups holds the string denoting the user_allowed_groups edge name in mutations.
 	EdgeUserAllowedGroups = "user_allowed_groups"
 	// Table holds the table name of the user in the database.
@@ -126,6 +128,13 @@ const (
 	PromoCodeUsagesInverseTable = "promo_code_usages"
 	// PromoCodeUsagesColumn is the table column denoting the promo_code_usages relation/edge.
 	PromoCodeUsagesColumn = "user_id"
+	// PaymentOrdersTable is the table that holds the payment_orders relation/edge.
+	PaymentOrdersTable = "payment_orders"
+	// PaymentOrdersInverseTable is the table name for the PaymentOrder entity.
+	// It exists in this package in order to avoid circular dependency with the "paymentorder" package.
+	PaymentOrdersInverseTable = "payment_orders"
+	// PaymentOrdersColumn is the table column denoting the payment_orders relation/edge.
+	PaymentOrdersColumn = "user_id"
 	// UserAllowedGroupsTable is the table that holds the user_allowed_groups relation/edge.
 	UserAllowedGroupsTable = "user_allowed_groups"
 	// UserAllowedGroupsInverseTable is the table name for the UserAllowedGroup entity.
@@ -414,6 +423,20 @@ func ByPromoCodeUsages(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
 	}
 }
 
+// ByPaymentOrdersCount orders the results by payment_orders count.
+func ByPaymentOrdersCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newPaymentOrdersStep(), opts...)
+	}
+}
+
+// ByPaymentOrders orders the results by payment_orders terms.
+func ByPaymentOrders(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newPaymentOrdersStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+
 // ByUserAllowedGroupsCount orders the results by user_allowed_groups count.
 func ByUserAllowedGroupsCount(opts ...sql.OrderTermOption) OrderOption {
 	return func(s *sql.Selector) {
@@ -490,6 +513,13 @@ func newPromoCodeUsagesStep() *sqlgraph.Step {
 		sqlgraph.Edge(sqlgraph.O2M, false, PromoCodeUsagesTable, PromoCodeUsagesColumn),
 	)
 }
+func newPaymentOrdersStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(PaymentOrdersInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.O2M, false, PaymentOrdersTable, PaymentOrdersColumn),
+	)
+}
 func newUserAllowedGroupsStep() *sqlgraph.Step {
 	return sqlgraph.NewStep(
 		sqlgraph.From(Table, FieldID),

backend/ent/user/where.go

@@ -1067,6 +1067,29 @@ func HasPromoCodeUsagesWith(preds ...predicate.PromoCodeUsage) predicate.User {
 	})
 }
 
+// HasPaymentOrders applies the HasEdge predicate on the "payment_orders" edge.
+func HasPaymentOrders() predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := sqlgraph.NewStep(
+			sqlgraph.From(Table, FieldID),
+			sqlgraph.Edge(sqlgraph.O2M, false, PaymentOrdersTable, PaymentOrdersColumn),
+		)
+		sqlgraph.HasNeighbors(s, step)
+	})
+}
+
+// HasPaymentOrdersWith applies the HasEdge predicate on the "payment_orders" edge with a given conditions (other predicates).
+func HasPaymentOrdersWith(preds ...predicate.PaymentOrder) predicate.User {
+	return predicate.User(func(s *sql.Selector) {
+		step := newPaymentOrdersStep()
+		sqlgraph.HasNeighborsWith(s, step, func(s *sql.Selector) {
+			for _, p := range preds {
+				p(s)
+			}
+		})
+	})
+}
+
 // HasUserAllowedGroups applies the HasEdge predicate on the "user_allowed_groups" edge.
 func HasUserAllowedGroups() predicate.User {
 	return predicate.User(func(s *sql.Selector) {