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/hook/hook.go

@@ -105,6 +105,42 @@ func (f IdempotencyRecordFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.
 	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.IdempotencyRecordMutation", m)
 }
 
+// The PaymentAuditLogFunc type is an adapter to allow the use of ordinary
+// function as PaymentAuditLog mutator.
+type PaymentAuditLogFunc func(context.Context, *ent.PaymentAuditLogMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f PaymentAuditLogFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.PaymentAuditLogMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PaymentAuditLogMutation", m)
+}
+
+// The PaymentOrderFunc type is an adapter to allow the use of ordinary
+// function as PaymentOrder mutator.
+type PaymentOrderFunc func(context.Context, *ent.PaymentOrderMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f PaymentOrderFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.PaymentOrderMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PaymentOrderMutation", m)
+}
+
+// The PaymentProviderInstanceFunc type is an adapter to allow the use of ordinary
+// function as PaymentProviderInstance mutator.
+type PaymentProviderInstanceFunc func(context.Context, *ent.PaymentProviderInstanceMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f PaymentProviderInstanceFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.PaymentProviderInstanceMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PaymentProviderInstanceMutation", m)
+}
+
 // The PromoCodeFunc type is an adapter to allow the use of ordinary
 // function as PromoCode mutator.
 type PromoCodeFunc func(context.Context, *ent.PromoCodeMutation) (ent.Value, error)
@@ -177,6 +213,18 @@ func (f SettingFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, err
 	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.SettingMutation", m)
 }
 
+// The SubscriptionPlanFunc type is an adapter to allow the use of ordinary
+// function as SubscriptionPlan mutator.
+type SubscriptionPlanFunc func(context.Context, *ent.SubscriptionPlanMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f SubscriptionPlanFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.SubscriptionPlanMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.SubscriptionPlanMutation", m)
+}
+
 // The TLSFingerprintProfileFunc type is an adapter to allow the use of ordinary
 // function as TLSFingerprintProfile mutator.
 type TLSFingerprintProfileFunc func(context.Context, *ent.TLSFingerprintProfileMutation) (ent.Value, error)