DNS over TLS and HTTPS set up in one step

jarl encrypted-dns setup (and the Encrypted DNS page) finds or obtains a
certificate for the host name, checks that nothing else listens on the
DoT and DoH ports at the chosen addresses (offering a free DoH port), and
stages named's tls statement and listeners as one change, keeping port 53
where it was when there was no listen-on, plus the host name's records in
the private views (local to the view in a linked zone). Status shows what
to give Android, Linux, Firefox, Chrome and Windows clients. A tls
statement with missing files is refused (tls_file_missing), and a
certificate named uses can't be deleted. docs/encrypted-dns.md, e2e with
real DoT and DoH queries.

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

internal/web/static/assets/style.css

@@ -518,3 +518,7 @@ td textarea.code { min-width: min(72ch, 50vw); }
 table.pick-list tr.pick { cursor: pointer; }
 table.pick-list tr.pick td:first-child { width: 2em; }
 table.pick-list tr.pick.selected { background: var(--accent-soft); }
+
+/* Encrypted DNS: a protocol per line with its port. */
+.enc-ports > div { margin: 2px 0; }
+.enc-ports input[type=number] { display: inline-block; }