feat(listings): add ROOM_RENTAL, CONDOTEL, SERVICED_APARTMENT property types (GOO-20)

- Add ROOM_RENTAL, CONDOTEL, SERVICED_APARTMENT to PropertyType enum in schema.prisma
- Create migration 20260422010000_add_room_rental_property_types with ALTER TYPE ADD VALUE
- Add DEFAULT_RANGES in PrismaPriceValidator: ROOM_RENTAL 1M-10M VND/month, CONDOTEL 20M-300M, SERVICED_APARTMENT 20M-250M VND/m²
- Add i18n translations: vi "Phòng trọ / Condotel / Căn hộ dịch vụ", en "Room Rental / Condotel / Serviced Apartment"
- Typesense indexes propertyType as a generic string facet — no schema change needed

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

.env.example

@@ -111,23 +111,47 @@ NEXT_PUBLIC_MAPBOX_TOKEN=
 
 # -----------------------------------------------------------------------------
 # Payment Gateways (VNPay, MoMo, ZaloPay)
-# Leave empty if not using payment features
+# Leave empty if not using payment features.
+#
+# IMPORTANT: The values below default to SANDBOX endpoints. When deploying
+# with NODE_ENV=production, swap each *_BASE_URL / *_ENDPOINT to the
+# production URL and set *_TMN_CODE / *_PARTNER_CODE / *_APP_ID / secret
+# values to live merchant credentials issued by the gateway. See
+# docs/payment-go-live-checklist.md for the full cutover procedure.
+# The API logs a startup warning if production mode is detected with
+# sandbox-looking credentials.
 # -----------------------------------------------------------------------------
+
+# VNPay — sandbox by default
+# Production: VNPAY_BASE_URL=https://pay.vnpay.vn/vpcpay.html
+# Production: VNPAY_API_URL=https://merchant.vnpay.vn/merchant_webapi/api/transaction
 VNPAY_TMN_CODE=
 VNPAY_HASH_SECRET=
 VNPAY_BASE_URL=https://sandbox.vnpayment.vn/paymentv2/vpcpay.html
 VNPAY_API_URL=https://sandbox.vnpayment.vn/merchant_webapi/api/transaction
 
+# MoMo — sandbox by default
+# Production: MOMO_ENDPOINT=https://payment.momo.vn/v2/gateway/api
 MOMO_PARTNER_CODE=
 MOMO_ACCESS_KEY=
 MOMO_SECRET_KEY=
 MOMO_ENDPOINT=https://test-payment.momo.vn/v2/gateway/api
 
+# ZaloPay — sandbox by default
+# Production: ZALOPAY_ENDPOINT=https://openapi.zalopay.vn/v2
 ZALOPAY_APP_ID=
 ZALOPAY_KEY1=
 ZALOPAY_KEY2=
 ZALOPAY_ENDPOINT=https://sb-openapi.zalopay.vn/v2
 
+# Backend base URL used to construct IPN (server-to-server) callback URLs for
+# MoMo (ipnUrl) and ZaloPay (callback_url).  Must point to the API server, NOT
+# the frontend.  Example: https://api.goodgo.vn
+# Individual gateway callback paths are appended automatically:
+#   MoMo    → {PAYMENT_CALLBACK_BASE_URL}/api/v1/payments/callback/momo
+#   ZaloPay → {PAYMENT_CALLBACK_BASE_URL}/api/v1/payments/callback/zalopay
+PAYMENT_CALLBACK_BASE_URL=https://api.goodgo.vn
+
 BANK_TRANSFER_ACCOUNT_NUMBER=
 BANK_TRANSFER_BANK_NAME=
 BANK_TRANSFER_ACCOUNT_HOLDER=