fix(lastleg): complete relabel document contract and regression gates

scripts/synchronous-dependency-baseline.mjs

@@ -169,6 +169,8 @@ export const SYNCHRONOUS_CLIENTS = Object.freeze([
     'lastleg-service', 'warehouse-overseas-service', ['REQUEST'], 'READ_WRITE', 'IDEMPOTENCY_KEY', '托盘变更/补偿使用 operationKey 与请求哈希'),
   http('lastleg-service/src/main/java/com/baiyue/lastleg/procurement/gateway/HttpProcurementFileGateway.java',
     'lastleg-service', 'file-service', ['REQUEST'], 'WRITE', 'NONE', '采购凭证和签收文件上传无幂等键，禁止客户端自动重试'),
+  http('lastleg-service/src/main/java/com/baiyue/lastleg/relabel/gateway/HttpRelabelDocumentFileGateway.java',
+    'lastleg-service', 'file-service', ['REQUEST'], 'READ_WRITE', 'MIXED', '换标PDF上传无幂等键，按客户/业务类型/业务单归属下载只读，传输层不自动重试'),
   http('lastleg-service/src/main/java/com/baiyue/lastleg/relabel/pda/gateway/HttpRelabelPhotoFileGateway.java',
     'lastleg-service', 'file-service', ['REQUEST'], 'READ_WRITE', 'MIXED', '上传无幂等键，元数据校验可重复'),
   http('integration-service/src/main/java/com/baiyue/integration/provider/EvergreenTrackingClient.java',