Merge range rate data into availability-range and remove old rate endpoint

docs/API_REFERENCE.txt

@@ -1004,6 +1004,7 @@ ROOM TYPE + ROOMS + ROOM IMAGES
   What it does:
 
   - Returns free rooms in date range.
+  - Includes per-room-type average rate (`averageRate`, `currency`, `ratePlanCode`).
   - Uses forecast logic for active stays: if `toAt` is null, occupancy is considered up to booking `expectedCheckOutAt` (if present).
   - Active stays with no expected checkout are treated as occupied.
 
@@ -1013,34 +1014,6 @@ ROOM TYPE + ROOMS + ROOM IMAGES
 
   Query params:
 
-  - from=YYYY-MM-DD
-  - to=YYYY-MM-DD
-
-  - Allowed roles: property member.
-
-  Error Codes
-
-  - 400 Bad Request (invalid date/range)
-  - 401 Unauthorized
-  - 403 Forbidden
-  - 404 Not Found (property)
-
-
-- Availability with rate API is this one:
-
-  GET /properties/{propertyId}/rooms/available-range-with-rate
-
-  What it does:
-
-  - Returns available rooms with average rate over date range.
-  - Uses same forecast occupancy logic as availability-range.
-
-  Request body:
-
-  - None.
-
-  Query params:
-
   - from=YYYY-MM-DD
   - to=YYYY-MM-DD
   - ratePlanCode (optional)