fix(firstleg): align merchant billing with sent fees

firstleg/src/main/java/com/baiyue/firstleg/controller/MerchantInboundBillingController.java

@@ -30,7 +30,7 @@ public class MerchantInboundBillingController {
     @PreAuthorize("hasAuthority('merchant:order:view')")
     @Operation(summary = "查询订单入库结果和最新费用",
         description = "客户按登录态客户范围只读查看；入库流程达到 WAIT_SPLIT 后，"
-            + "在 LOADING、LOADED、DELIVERED 仍持续可见，且始终要求 APPROVED + CONFIRMED "
+            + "在 LOADING、LOADED、DELIVERED 仍持续可见，且始终要求 APPROVED + SENT "
             + "并存在已发布入库运费明细，不需要客户确认费用。")
     public ApiResponse<MerchantInboundBillingResponse> find(
         @AuthenticationPrincipal AuthenticatedUser user, @PathVariable long orderId) {

firstleg/src/main/java/com/baiyue/firstleg/service/MerchantInboundBillingService.java

@@ -126,7 +126,7 @@ public class MerchantInboundBillingService {
     private static boolean isPublished(InboundOrderEntity inbound) {
         return PUBLISHED_BILLING_PROCESS_STATUSES.contains(inbound.getProcessStatus())
             && "APPROVED".equals(inbound.getMeasureReviewStatus())
-            && "CONFIRMED".equals(inbound.getFeeStatus());
+            && "SENT".equals(inbound.getFeeStatus());
     }
 
     private String previewUrl(long orderId, long fileId) {

firstleg/src/main/resources/openapi/firstleg-v1.yaml

@@ -905,7 +905,7 @@ paths:
   /api/merchant/v1/first-leg/orders/{orderId}/inbound-billing:
     get:
       summary: 客户查询已完成入库结果和最新已发布费用
-      description: 需要 merchant:order:view 权限；客户仅能按登录态客户范围只读查看。入库流程达到 WAIT_SPLIT 后，费用在 LOADING、LOADED、DELIVERED 仍持续可见；始终要求 measureReviewStatus=APPROVED、feeStatus=CONFIRMED 且存在 PUBLISHED 入库运费明细，不需要客户确认费用。
+      description: 需要 merchant:order:view 权限；客户仅能按登录态客户范围只读查看。入库流程达到 WAIT_SPLIT 后，费用在 LOADING、LOADED、DELIVERED 仍持续可见；始终要求 measureReviewStatus=APPROVED、feeStatus=SENT 且存在 PUBLISHED 入库运费明细，不需要客户确认费用。CONFIRMED 只表示发送前确认完成，尚未生成可对客发布明细。
       parameters:
         - {name: orderId, in: path, required: true, schema: {type: string, pattern: '^[1-9][0-9]*$'}}
       responses: