Auto-set content type based on camera mode (v0.2.5b3)

• Added automatic content type selection in _convert_to_binary():

  • MAP_VIEW mode → JPEG format (optimized for map images)
  • OBSTACLE_VIEW mode → PNG format (preserves obstacle details)

• Implementation is library-safe:

  • Works with CameraModes constants (CameraModes.MAP_VIEW)
  • Works with direct string values ("map_view")
  • Added CameraModes to utils.py imports

• Version bump: 0.2.5b2 → 0.2.5b3

  • Updated pyproject.toml
  • Updated init.py

Quality checks:

• Ruff: All checks passed!
• isort: All imports properly sorted
• Pylint: 9.98/10 (no new issues)
  Full Changelog: v0.2.5b2...v0.2.5b3