feat: label-ocr 默认只处理英国(GB)

flows/label_ocr.py

@@ -86,10 +86,10 @@ def process_all(pending: list) -> dict[str, int]:
 
 
 @flow(name="label-ocr", log_prints=True)
-def label_ocr(destination_country: str | None = None, courier_source: str | None = None) -> dict:
-    """面单 OCR enrichment。可选按 destinationCountry / courierSource 筛选优先处理。
+def label_ocr(destination_country: str | None = 'GB', courier_source: str | None = None) -> dict:
+    """面单 OCR enrichment。默认只处理英国(GB),可选 courierSource 进一步筛选。
 
-    例: label_ocr(destination_country='GB', courier_source='手动物流')
+    手动跑其他国家: label_ocr(destination_country='US')
     """
     db = SyncDB()
     before = db.count_ocr_status()