Store DOB in guest age and return in booking detail

src/main/kotlin/com/android/trisolarisserver/controller/BookingSnapshotBuilder.kt

@@ -59,6 +59,7 @@ class BookingSnapshotBuilder(
             guestPhone = guest?.phoneE164,
             guestNationality = guest?.nationality,
             guestAddressText = guest?.addressText,
+            guestAge = guest?.age,
             guestSignatureUrl = signatureUrl,
             vehicleNumbers = vehicleNumbers,
             roomNumbers = roomNumbers,

src/main/kotlin/com/android/trisolarisserver/controller/dto/BookingDtos.kt

@@ -84,6 +84,7 @@ data class BookingDetailResponse(
     val guestPhone: String?,
     val guestNationality: String?,
     val guestAddressText: String?,
+    val guestAge: String?,
     val guestSignatureUrl: String?,
     val vehicleNumbers: List<String>,
     val roomNumbers: List<Int>,