fix(prometheus): a refused token stops the scraping, as Home Assistant bans an address after a few refusals (#6355)

Also names the Home Assistant connection by its address in the audit log and
timeline, where its id showed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/plugins/prometheus/test_mcp_tools.py

@@ -15,7 +15,7 @@ def _target(name, *, enabled=True, scraped=timedelta(seconds=30), error=None,
             url="http://archives:8080/metrics"):
     return NS(id=f"id-{name}", name=name, url=url, token="bearer-s3cret", enabled=enabled,
               interval_seconds=60, last_scraped_at=NOW - scraped if scraped else None,
-              last_ok_at=NOW - timedelta(hours=1), last_error=error, last_kept=120, last_dropped=30,
+              last_ok_at=NOW - timedelta(hours=1), last_error=error, refused=False, last_kept=120, last_dropped=30,
               last_capped=0, series_cap=1000, keep=["archives_*"], drop=[])