printedparts stage 14: retire/restore in the UI, dashless item codes

Retire button with confirmation on the detail page (item leaves the
storefront and the kiosk rejects its code; ledger history and label
survive), Restore on retired items, and an Include-retired list toggle
with a badge. Restore is its own permission-gated POST - the generic
update still cannot flip isactive. New codes mint as WJRP0042 style
without the dash; existing codes are immutable bin labels and keep
their form.

plugins/printedparts/api/routes.py

@@ -91,7 +91,7 @@ def _imagedir():
 def _mint_itemcode(item):
     """Set itemcode from the configured prefix + the flushed row id."""
     prefix = Setting.get('printedparts_code_prefix') or '3DP'
-    item.itemcode = f'{prefix}-{item.printeditemid:04d}'
+    item.itemcode = f'{prefix}{item.printeditemid:04d}'
 
 
 @printedparts_bp.route('/items', methods=['POST'])
@@ -159,6 +159,20 @@ def delete_item(item_id: int):
     return success_response(message='Printed item retired')
 
 
+@printedparts_bp.route('/items/<int:item_id>/restore', methods=['POST'])
+@jwt_required()
+@require_permission('printedparts.delete')
+def restore_item(item_id: int):
+    """Bring a retired item back; code, photo, and history are intact."""
+    item = db.session.get(PrintedItem, item_id)
+    if not item:
+        return error_response(ErrorCodes.NOT_FOUND,
+                              f'Printed item {item_id} not found', http_code=404)
+    item.isactive = True
+    db.session.commit()
+    return success_response(item.to_dict(), message='Printed item restored')
+
+
 # --- item image: the models.py upload/serve/delete trio ---------------------
 
 @printedparts_bp.route('/items/<int:item_id>/image', methods=['POST'])