fix(subscriptions): atomic UsageRecord metering to prevent quota bypass

- Add @@unique([subscriptionId, metric, periodStart, periodEnd]) constraint
  to UsageRecord model with corresponding migration
- Replace racy findFirst+update/create pattern with Prisma upsert using
  INSERT ON CONFLICT DO UPDATE SET count = count + delta
- Fix CheckQuotaHandler to use period-scoped findUnique instead of
  unscoped findFirst, preventing stale cross-period reads
- Update tests to reflect atomic upsert pattern

Closes GOO-4

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/messages/en.json

@@ -126,7 +126,10 @@
     "VILLA": "Villa",
     "LAND": "Land",
     "OFFICE": "Office",
-    "SHOPHOUSE": "Shophouse"
+    "SHOPHOUSE": "Shophouse",
+    "ROOM_RENTAL": "Room Rental",
+    "CONDOTEL": "Condotel",
+    "SERVICED_APARTMENT": "Serviced Apartment"
   },
   "transactionTypes": {
     "SALE": "Sale",

apps/web/messages/vi.json

@@ -126,7 +126,10 @@
     "VILLA": "Biệt thự",
     "LAND": "Đất nền",
     "OFFICE": "Văn phòng",
-    "SHOPHOUSE": "Shophouse"
+    "SHOPHOUSE": "Shophouse",
+    "ROOM_RENTAL": "Phòng trọ",
+    "CONDOTEL": "Condotel",
+    "SERVICED_APARTMENT": "Căn hộ dịch vụ"
   },
   "transactionTypes": {
     "SALE": "Bán",