Add data generation scripts and public holidays service

- Add scripts for generating booking data, building metadata, and
  updating holidays
- Implement public_holidays.py service with holiday lookup functionality
- Update CSV data with expanded hotel booking records
- Add holidays.json dataset for public holiday dates
- Enhance LLM report service with improved formatting
- Update metadata domain model and API dependencies
- Add test coverage for dataset and public holidays

tests/conftest.py

@@ -109,6 +109,6 @@ def hotel_metadata() -> HotelMetadata:
         currency="USD",
         room_types={
             "A": RoomType(size="Small", standard_price_per_night=20, room_count=10),
-            "B": RoomType(size="Large", standard_price_per_night=25, room_count=5),
+            "B": RoomType(size="Large", standard_price_per_night=25, room_count=10),
         },
     )