fix(provision): reconcile channel pricing and hosted access

internal/host/sub2api/flexible_id.go

@@ -48,12 +48,41 @@ func flexibleIDSliceValues(raw []string) []any {
 }
 
 func (r CreateChannelRequest) MarshalJSON() ([]byte, error) {
+	modelMapping := map[string]map[string]string{}
+	platform := strings.TrimSpace(r.Platform)
+	if platform == "" {
+		platform = "openai"
+	}
+	if len(r.ModelMapping) > 0 {
+		inner := make(map[string]string, len(r.ModelMapping))
+		for key, value := range r.ModelMapping {
+			inner[key] = value
+		}
+		modelMapping[platform] = inner
+	}
+	modelPricing := make([]ChannelModelPricing, 0, len(r.ModelPricing))
+	for _, entry := range r.ModelPricing {
+		pricing := entry
+		if strings.TrimSpace(pricing.Platform) == "" {
+			pricing.Platform = platform
+		}
+		modelPricing = append(modelPricing, pricing)
+	}
+
 	return json.Marshal(struct {
-		Name     string `json:"name"`
-		GroupIDs []any  `json:"group_ids"`
+		Name               string                       `json:"name"`
+		GroupIDs           []any                        `json:"group_ids"`
+		ModelMapping       map[string]map[string]string `json:"model_mapping,omitempty"`
+		ModelPricing       []ChannelModelPricing        `json:"model_pricing,omitempty"`
+		RestrictModels     bool                         `json:"restrict_models,omitempty"`
+		BillingModelSource string                       `json:"billing_model_source,omitempty"`
 	}{
-		Name:     r.Name,
-		GroupIDs: flexibleIDSliceValues(r.GroupIDs),
+		Name:               r.Name,
+		GroupIDs:           flexibleIDSliceValues(r.GroupIDs),
+		ModelMapping:       modelMapping,
+		ModelPricing:       modelPricing,
+		RestrictModels:     r.RestrictModels,
+		BillingModelSource: r.BillingModelSource,
 	})
 }