fix(loyalty): resolve critical production readiness issues

- Add pessimistic locking (SELECT FOR UPDATE) on card write operations
  to prevent race conditions in stamp_service and points_service
- Replace 16 console.log/error/warn calls with LogConfig.createLogger()
  in 3 storefront JS files (dashboard, history, enroll)
- Delete all stale lu.json locale files across 8 modules (lb is the
  correct ISO 639-1 code for Luxembourgish)
- Update architecture rules and docs to reference lb.json not lu.json
- Add production-readiness.md report for loyalty module

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

app/modules/loyalty/locales/lu.json

@@ -1,72 +0,0 @@
-{
-  "loyalty": {
-    "module": {
-      "name": "Treieprogrammer",
-      "description": "Stempel- a punktebaséiert Treieprogrammer mat Wallet-Integratioun"
-    },
-    "program": {
-      "title": "Treieprogramm",
-      "create": "Programm erstellen",
-      "edit": "Programm beaarbechten",
-      "activate": "Aktivéieren",
-      "deactivate": "Deaktivéieren",
-      "type": {
-        "stamps": "Stempelen",
-        "points": "Punkten",
-        "hybrid": "Hybrid"
-      }
-    },
-    "card": {
-      "title": "Treiekaart",
-      "number": "Kaartennummer",
-      "qr_code": "QR-Code",
-      "enroll": "Client umellen",
-      "deactivate": "Kaart deaktivéieren"
-    },
-    "stamp": {
-      "title": "Stempelen",
-      "add": "Stempel dobäisetzen",
-      "redeem": "Belounung aléisen",
-      "count": "{current} vun {target}",
-      "until_reward": "Nach {count} bis zur Belounung"
-    },
-    "points": {
-      "title": "Punkten",
-      "earn": "Punkten sammelen",
-      "redeem": "Punkten aléisen",
-      "balance": "{count} Punkten",
-      "per_euro": "{points} Punkten pro Euro"
-    },
-    "pin": {
-      "title": "Mataarbechter-PINen",
-      "create": "PIN erstellen",
-      "edit": "PIN beaarbechten",
-      "unlock": "PIN entspären",
-      "locked": "PIN gespaart bis {time}"
-    },
-    "wallet": {
-      "google": "Bäi Google Wallet bäisetzen",
-      "apple": "Bäi Apple Wallet bäisetzen"
-    },
-    "stats": {
-      "title": "Statistiken",
-      "total_cards": "Total Kaarten",
-      "active_cards": "Aktiv Kaarten",
-      "stamps_issued": "Ausgestallte Stempelen",
-      "rewards_redeemed": "Agelëst Belounungen"
-    },
-    "errors": {
-      "program_not_found": "Treieprogramm net fonnt",
-      "program_inactive": "Treieprogramm ass net aktiv",
-      "card_not_found": "Treiekaart net fonnt",
-      "card_inactive": "Treiekaart ass net aktiv",
-      "cooldown": "Waart w.e.g. {minutes} Minutten virum nächste Stempel",
-      "daily_limit": "Dageslimit vun {limit} Stempelen erreecht",
-      "insufficient_stamps": "Brauch {required} Stempelen, hutt {current}",
-      "insufficient_points": "Brauch {required} Punkten, hutt {current}",
-      "pin_required": "Mataarbechter-PIN erfuerdert",
-      "pin_invalid": "Ongültege PIN",
-      "pin_locked": "PIN gespaart wéinst ze vill Feelverséich"
-    }
-  }
-}