Add room-type quantity reservation APIs

src/main/kotlin/com/android/trisolarisserver/repo/room/RoomStayRepo.kt

@@ -139,6 +139,24 @@ interface RoomStayRepo : JpaRepository<RoomStay, UUID> {
         @Param("roomStayId") roomStayId: UUID,
         @Param("bookingId") bookingId: UUID
     ): RoomStay?
+
+    @Query(
+        """
+        select count(distinct rs.room.id)
+        from RoomStay rs
+        where rs.property.id = :propertyId
+          and rs.room.roomType.id = :roomTypeId
+          and rs.isVoided = false
+          and rs.fromAt < :toAt
+          and (rs.toAt is null or rs.toAt > :fromAt)
+        """
+    )
+    fun countOccupiedByTypeInRange(
+        @Param("propertyId") propertyId: UUID,
+        @Param("roomTypeId") roomTypeId: UUID,
+        @Param("fromAt") fromAt: java.time.OffsetDateTime,
+        @Param("toAt") toAt: java.time.OffsetDateTime
+    ): Long
 }
 
 interface BookingRoomNumberRow {