fix: 迁移码返回完整URL；确认须在目标店；兼容扫码接收

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

jituan/services/club_migrate.py

@@ -980,6 +980,12 @@ def serialize_plan(plan: ClubMigratePlan) -> dict:
 
 
 def serialize_token(token_row: ClubMigrateToken) -> dict:
+    qr = (token_row.qrcode_url or '').strip()
+    if qr and not qr.startswith('http'):
+        from django.conf import settings
+        cos_domain = getattr(settings, 'COS_DOMAIN', '').rstrip('/')
+        if cos_domain:
+            qr = f'{cos_domain}/{qr.lstrip("/")}'
     return {
         'token': token_row.token,
         'scene': scene_for_token(token_row.token),
@@ -987,7 +993,7 @@ def serialize_token(token_row: ClubMigrateToken) -> dict:
         'from_club_id': token_row.from_club_id,
         'to_club_id': token_row.to_club_id,
         'status': token_row.status,
-        'qrcode_url': token_row.qrcode_url or '',
+        'qrcode_url': qr,
         'expire_at': token_row.expire_at.isoformat() if token_row.expire_at else '',
         'asset_snapshot': token_row.asset_snapshot or {},
     }