Add IP search and status filter to the Overview and Registry dashboard pages

Both pages rendered their full lists with no way to narrow them. Adds a
?q=&status= filter (substring match on address, exact match on result
status) applied dashboard-side, in Go, over the already-fetched list —
no control-api/db changes needed.

Overview: the filter form lives outside the polling target (#overview-live)
so the recurring poll never wipes out what's typed/selected; the poll and
both filter inputs share hx-sync="#overview-live:queue last" (the same
fix that resolved the earlier abandoned /ips auto-refresh races) and the
poll now carries hx-include="#overview-filter" so it keeps honoring the
current filter on every tick. Applies uniformly to both the "Текущая
проверка" and "Последние N завершённых" tables, per the confirmed design:
picking a specific status naturally hides in-progress rows, since they
have no result yet.

Registry: no polling exists there, so the filter form reuses the full page
via hx-select/hx-replace-url — simpler than adding a parallel fragment
endpoint, and gives a bookmarkable/shareable filtered URL.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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