testing: bootstrap UI, agent reliability, NS-01..04 + alert username

Smoothes the rough edges that came up exercising a live deployment.

First-run bootstrap UI: /bootstrap renders a username + password form
that uses the in-memory token directly (operator no longer copies it
out of the log); /login redirects there while bootstrap is available.

Agent reliability: failJob synthetic envelopes so command.run early
returns no longer hang the server-side job; runtime probe of restic
restore --help drives --no-ownership instead of version sniffing
(0.18.x had it removed). Server unit re-shaped: ProtectSystem=full
plus ReadWritePaths=/etc/restic-manager, no ProtectHome — restore
can now write anywhere a user might want.

Restore wizard: default target is /root/rm-restore/<job-id>/ with
clearer help text. Re-init confirm input uses .field (was .input,
which doesn't exist — text was invisible).

NS-01 host delete: store DeleteHost, admin-band /hosts/{id}/delete
with hostname-confirm danger zone, audit, FK cascade, live WS close.

NS-02 enrollment-token recovery: outstanding-tokens panel on
/hosts/new, regenerate (preserves attachments) and revoke handlers
+ audit, store-level ListOutstandingEnrollmentTokens and
DeleteEnrollmentToken.

NS-03 repo init / probe surface: migration 0020 adds
hosts.repo_status + repo_status_error; WS handler projects every
init job's outcome onto the host row (idempotent already-initialised
collapses to ready); creds-save resets status and dispatches a fresh
probe; /hosts/{id}/repo/probe retry endpoint with banner.

NS-04 dashboard live + sort + filter: query-string filter
(q/status/repo_status/tag/sort/dir), 5s htmx live poll mirroring the
alerts pattern with a localStorage live toggle, sortable column
headers, filter row + clear.

Alerts page: ack'd-by line resolves user_id ULID to username.

Compose.yaml ignored — host-specific.

internal/server/http/ui_repo.go

@@ -334,8 +334,19 @@ func (s *Server) handleUIRepoCredentialsSave(w stdhttp.ResponseWriter, r *stdhtt
 		stdhttp.Error(w, "internal", stdhttp.StatusInternalServerError)
 		return
 	}
+	// NS-03: clear repo_status — the new creds may reach a different
+	// repo or fix an auth typo, so any prior probe outcome is stale.
+	if err := s.deps.Store.SetHostRepoStatus(r.Context(), host.ID, "unknown", ""); err != nil {
+		slog.Warn("ui repo creds: reset repo_status", "host_id", host.ID, "err", err)
+	}
 	if s.deps.Hub != nil && s.deps.Hub.Connected(host.ID) {
 		_ = s.pushRepoCredsToAgent(r.Context(), host.ID, existing)
+		// NS-03: probe the new creds immediately — surface bad
+		// password / wrong URL on the host detail page rather than at
+		// the next scheduled job.
+		if err := s.dispatchInitJob(r.Context(), host.ID, "user", &u.ID); err != nil {
+			slog.Warn("ui repo creds: dispatch init", "host_id", host.ID, "err", err)
+		}
 	}
 	stdhttp.Redirect(w, r, "/hosts/"+host.ID+"/repo?saved=credentials", stdhttp.StatusSeeOther)
 }