#475 feat(doctor): report optional UI extras

[Anonymous]

Originally created by: slegarraga

Closes [#440]

What

• Adds read-only doctor rows for the optional dash and tui extras.
• Uses importlib.util.find_spec so diagnosis never imports either UI dependency.
• Reports missing extras as non-critical warnings with the matching install hint.

Tests

• .venv/bin/pytest tests/unit/test_cli_doctor.py — 20 passed.
• .venv/bin/ruff check src/doberman/cli/doctor.py tests/unit/test_cli_doctor.py — passed.
• .venv/bin/ruff format --check src/doberman/cli/doctor.py tests/unit/test_cli_doctor.py — passed.

[Anonymous]

Ticket changed by: fu351

• status: open --> closed

[Anonymous]

Ticket changed by: fu351

• status: closed --> open

[Anonymous]

Ticket changed by: fu351

• status: open --> closed

[Anonymous]

Originally posted by: fu351

Merged, thanks @slegarraga! Checking find_spec instead of importing keeps doctor cheap and side-effect free, and the shared _check_optional_extra helper makes a third extra a one-line addition.