feat(botsort): add integration tests and fix ruff/mypy errors

[SkalskiP]

Add BoT-SORT integration tests and fix pre-commit errors

• Wired BoTSORTTracker into the registry (tracker_id = "botsort") and exported it from
  trackers/__init__.py
• Made frame parameter optional in update() (already handled None internally) so the tracker
  works with the existing GT-based test infrastructure
• Added "botsort" to the integration test suite — verified expected metric values in the JSON
  files are correct (DanceTrack: HOTA 79.999, MOTA 99.511; SportsMOT: HOTA 85.544, MOTA
  98.925)
• Fixed 1 ruff error (line too long) and 16 mypy errors across tracker.py,
  kalman_box_tracker.py, and cmc.py — all type-level fixes, no logic changes