fix(courier): parse XFX form-urlencoded track callbacks and raw ACK

Enable urlencoded body parser, return XFX {code,message} without API envelope, and harden callback payload parsing.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/dukang-api/src/callbacks/delivery-callback.service.ts

@@ -47,12 +47,14 @@ export class DeliveryCallbackService {
 
     const payload = this.xiaofeixiaProvider.parseTrackCallback(body);
     if (!payload) {
+      const response = this.courier.buildTrackCallbackResponse(false);
       await logCourierCall(this.prisma, {
         ...baseLog,
+        responseBody: response,
         status: 'FAILED',
         errorMessage: '回调体解析失败',
       });
-      return this.courier.buildTrackCallbackResponse(false);
+      return response;
     }
 
     const order = payload.outNumber
@@ -64,13 +66,15 @@ export class DeliveryCallbackService {
         : null;
 
     if (!order) {
+      const response = this.courier.buildTrackCallbackResponse(false);
       await logCourierCall(this.prisma, {
         ...baseLog,
+        responseBody: response,
         status: 'FAILED',
         errorMessage: '订单不存在',
         externalNo: payload.outNumber || payload.trackingNumber,
       });
-      return this.courier.buildTrackCallbackResponse(false);
+      return response;
     }
 
     const targetStatus = this.xiaofeixiaProvider.mapTrackStatus(