Two bugs in the migration function:
1. DELETE endpoint does not exist in Bring! API — must use PUT with
'remove' param (same as the remove-from-list flow elsewhere in the code)
2. Items were added using the Italian shopping_name as the 'purchase' field
instead of the German catalog key via italianToBring(shoppingName).
This created Italian/German duplicates (e.g. both 'Affettato' and
'Aufschnitt' in the list at the same time).
Also add a pre-add duplicate check so existing catalog-key items are not
double-added when the old specific item is removed.
Manual cleanup run: removed 25 stale/duplicate items, added 8 correct
German-key items, ran migration (1 more migrated). List is now clean.
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