fix gateway loopback validation chains

apps/api/internal/store/pricing_rules.go

@@ -176,6 +176,63 @@ func (s *Store) DeletePricingRuleSet(ctx context.Context, id string) error {
 	return nil
 }
 
+func (s *Store) PricingRuleSetBillingConfig(ctx context.Context, id string) (map[string]any, error) {
+	id = strings.TrimSpace(id)
+	if id == "" {
+		return nil, nil
+	}
+	rows, err := s.pool.Query(ctx, `
+SELECT resource_type, base_price::float8, dynamic_weight
+FROM model_pricing_rules
+WHERE rule_set_id = $1::uuid
+  AND status = 'active'
+ORDER BY priority ASC, resource_type ASC`, id)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	config := map[string]any{}
+	for rows.Next() {
+		var resourceType string
+		var basePrice float64
+		var dynamicWeightBytes []byte
+		if err := rows.Scan(&resourceType, &basePrice, &dynamicWeightBytes); err != nil {
+			return nil, err
+		}
+		dynamicWeight := decodeObject(dynamicWeightBytes)
+		switch resourceType {
+		case "text_input":
+			config["textInputPer1k"] = basePrice
+		case "text_output":
+			config["textOutputPer1k"] = basePrice
+		case "image":
+			config["imageBase"] = basePrice
+			config["image"] = pricingResourceConfig(basePrice, dynamicWeight)
+		case "image_edit":
+			config["editBase"] = basePrice
+			config["image_edit"] = pricingResourceConfig(basePrice, dynamicWeight)
+		case "video":
+			config["videoBase"] = basePrice
+			config["video"] = pricingResourceConfig(basePrice, dynamicWeight)
+		default:
+			config[resourceType] = pricingResourceConfig(basePrice, dynamicWeight)
+		}
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return config, nil
+}
+
+func pricingResourceConfig(basePrice float64, dynamicWeight map[string]any) map[string]any {
+	config := map[string]any{"basePrice": basePrice}
+	if len(dynamicWeight) > 0 {
+		config["dynamicWeight"] = dynamicWeight
+	}
+	return config
+}
+
 func insertPricingRules(ctx context.Context, tx pgx.Tx, ruleSetID string, defaultCurrency string, rules []PricingRuleInput) error {
 	for index, rule := range rules {
 		rule = normalizePricingRule(rule, index, defaultCurrency)