fix(loyalty): use Code 128 barcode for retail scanner compatibility

Switch wallet pass barcodes from QR to Code 128 format using the
card_number (digits only), so standard retail barcode scanners can
read loyalty cards. Apple Wallet keeps QR as fallback in barcodes
array. Also fix stale Vendor.loyalty_program relationship (now
company-based), add parent init calls in vendor JS components,
and update module docs to reflect Phase 2 completion.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/loyalty/services/google_wallet_service.py

@@ -275,8 +275,9 @@ class GoogleWalletService:
             "accountId": card.card_number,
             "accountName": card.card_number,
             "barcode": {
-                "type": "QR_CODE",
-                "value": card.qr_code_data,
+                "type": "CODE_128",
+                "value": card.card_number.replace("-", ""),
+                "alternateText": card.card_number,
             },
         }