[ADD] website_sale_aplicoop: create picking batches after cutoff

- Add stock_picking_batch dependency to manifest
- Add cutoff date validation in _confirm_linked_sale_orders()
- Create _create_picking_batches_for_sale_orders() method
- Group pickings by consumer_group_id into separate batches
- Set batch scheduled_date from group order pickup_date
- Add test_cron_picking_batch.py with 7 tests covering:
  - Skip orders before cutoff
  - Confirm orders after cutoff
  - Separate batches per consumer group
  - Same group orders in same batch
  - Batch has scheduled_date
  - No duplicate batches on re-run
  - Closed group orders not processed

website_sale_aplicoop/__manifest__.py

@@ -16,6 +16,7 @@
         "product",
         "sale",
         "stock",
+        "stock_picking_batch",
         "account",
         "product_get_price_helper",
     ],