The web UI's certificate from Let's Encrypt, through Jarl

tls.acme names the certificate and jarl: the Jarl server and a token that
may only write the challenge record. Steward gets the certificate with
DNS-01 (lego), writing the record through Jarl's API into every view that
has the zone, renews it with a third of its lifetime left and swaps it
in without a restart. A check runs before every order: Jarl, the zone,
the token's permission, a test record, the zone's name servers, public
resolvers, clean-up; each step says what to fix. Staging by default.

With a certificate, each listener serves HTTPS and plain HTTP on one port
(redirecting plain HTTP, except from the server itself).

steward cert / cert check / cert renew, Server -> Certificate in the web
UI, GET /certificate, POST /certificate/check|renew. docs/certificates.md
and docs/jarl.md (the Jarl user and the token's grant).

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

internal/server/h_leases.go

@@ -172,6 +172,9 @@ func (s *Server) status(w http.ResponseWriter, r *http.Request, p *auth.Principa
 	leases := s.dhcp.Leases()
 	out := api.Status{Build: version.Info(), Started: s.started, Interfaces: []api.InterfaceStatus{}, Subnets: []api.Subnet{},
 		Problems: s.eng.Problems(), Leases: map[string]int{}, Messages: s.dhcp.Counts(), Database: s.store.Path()}
+	if p.IsAdmin() {
+		out.Problems = append(out.Problems, s.certificateProblems()...)
+	}
 	if out.Problems == nil {
 		out.Problems = []validate.Problem{}
 	}