拆分 service 与前端大文件,修复 CORS 配置与格式问题

- 后端 internal/service 按职责拆分:
  fulfillment.go(1397→527)拆出 wallet/timeout/data/order/query/dashboard/shipnotify
  delivery.go(1124→801)拆出 upstream/link/state/helpers
  merchant.go(855→251)拆出 member/product/api_client/catalog/helpers
- 前端 MerchantCenter.tsx(1327→606)拆出 merchantCenterTabs/merchantCenterUtils
- docker-compose backend 透传 CORS_ALLOWED_ORIGINS
- CORS 白名单实现(config/router/README/.env.example 配套)
- 修复 gofmt 与文件尾部多余空行

backend/internal/service/delivery_state.go

@@ -0,0 +1,71 @@
+package service
+
+import (
+	"encoding/json"
+	"strings"
+	"time"
+
+	"affiliate_dash/internal/model"
+	"affiliate_dash/internal/pkg/timeutil"
+)
+
+func buildExistingDeliverySubmitResult(order *model.FulfillmentOrder) *DeliverySubmitResult {
+	if order == nil {
+		return nil
+	}
+	switch normalizeOrderStatus(order) {
+	case model.OrderStatusDelivering, model.OrderStatusDelivered:
+	default:
+		return nil
+	}
+	var resultData map[string]interface{}
+	if json.Valid([]byte(order.ResultData)) {
+		_ = json.Unmarshal([]byte(order.ResultData), &resultData)
+	}
+	providerOrderNo := firstNonEmpty(
+		order.ProviderOrderNo,
+		stringFromMap(resultData, "provider_order_no"),
+	)
+	message := "订单暂时正在发货中，请稍后查询"
+	status := normalizeOrderStatus(order)
+	if status == model.OrderStatusDelivered {
+		message = "订单已交付"
+	}
+	return &DeliverySubmitResult{
+		OrderNo:         order.OrderNo,
+		Status:          status,
+		Message:         message,
+		ProviderOrderNo: providerOrderNo,
+		UpstreamOrder:   resultData,
+	}
+}
+
+func upstreamDeliverySucceeded(order map[string]interface{}) bool {
+	return strings.EqualFold(stringFromMap(order, "status"), "FINISHED") ||
+		strings.EqualFold(stringFromMap(order, "send_status"), "SUCCESS")
+}
+
+func deliverySubmissionInProgress(stage string) bool {
+	return stage == deliveryStageClaimed || stage == deliveryStageQueueCreated
+}
+
+func deliverySubmissionStale(order *model.FulfillmentOrder, now time.Time) bool {
+	if order == nil {
+		return false
+	}
+	startedAtRaw := resultDataString(order.ResultData, "submit_started_at")
+	if startedAtRaw != "" {
+		if startedAt, err := time.Parse(timeutil.APITimeLayout, startedAtRaw); err == nil {
+			return now.Sub(startedAt) >= deliverySubmissionStaleTimeout
+		}
+	}
+	return !order.UpdatedAt.IsZero() && now.Sub(order.UpdatedAt) >= deliverySubmissionStaleTimeout
+}
+
+func optionalUint(value uint) *uint {
+	if value == 0 {
+		return nil
+	}
+	out := value
+	return &out
+}