add some coloring via rich

[thomaschristory]

life is better in colors.
make this on/off via the config file.

[thomaschristory]

Claiming this — implementing rich coloring via color_mode config. Branch: feat/issue-24-rich-coloring, scope: Tasks 1-9 per docs/superpowers/plans/2026-05-13-rich-coloring.md

[thomaschristory]

PR opened: #72. All 656 tests pass, lint clean.

[thomaschristory]

Shipped. PR #72 squash-merged to main (1604fb6). All CI green. Releasing in v1.0.5.

[thomaschristory]

Released in v1.0.5 — live on PyPI (pip install netbox-super-cli==1.0.5) and the GitHub Release. Clean-install verified: nsc --version → nsc 1.0.5.