- Removed PersonalStorage (redundant - RoomStorage handles both via room_id)
- Added ensure_room() and ensure_tracking() methods for explicit creation
- Added @runtime_checkable to Protocols for isinstance checks
- Added tests/test_ports.py with 11 unit tests for storage protocols
- Remove GroupBounty/PersonalBounty subclasses, use Bounty with optional created_by_user_id
- Combine UserData/GroupData into RoomData with room_id and is_group fields
- Add group_id field to TrackingData (supports negative Telegram group IDs)
- Add test_bounty_comparison_not_equal for verifying different bounties are not equal
- Update core/__init__.py exports