Add fluksio status, and ask for a run's parameters at a terminal

Two halves of the same gap: the CLI could start work but not show you any.

`fluksio status` draws the home screen's top half in a terminal — health and
what is wrong with it, every flow with its state and node count, and the
recent runs and failures under them. `--watch` keeps it there. Rich does the
drawing; it was already installed under fastapi's own CLI, and is named now
because a command depends on it.

`fluksio run` with no parameters at a terminal asks for them, one line per
declared input with its declared value in brackets — so Enter through the lot
is what running the defaults looks like, and an artifact input takes the
`@run:` spelling the engine now resolves. A scripted run is untouched: passing
any parameter, or piping the command, skips the questions, as does --defaults.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019V5bsYGNxcgPs4xXmTPx69

backend/tests/flow/test_runs.py

@@ -443,4 +443,3 @@ def test_a_node_with_no_fingerprint_is_never_looked_up():
     assert calls == [1]
     assert cache.asked == []
     assert seen[0].cache_key == ""
-