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/ws/handler.go

@@ -211,9 +211,22 @@ func dispatchAgentMessage(ctx context.Context, c *Conn, hostID string, env api.E
 			string(p.Status), p.ExitCode, p.Stats, errMsg, p.FinishedAt); err != nil {
 			slog.Warn("ws: mark job finished", "job_id", p.JobID, "err", err)
 		}
-		// repo_initialised_at projection has been removed — auto-init
-		// at host enrolment makes "is the repo init'd" derivable from
-		// the latest init job's status, no separate column needed.
+		// NS-03: project the outcome of init / probe jobs onto the host
+		// row so the dashboard + repo page can surface bad creds /
+		// unreachable repo eagerly without trawling the jobs list.
+		// We need the job's kind to gate this, so re-read it (cheap;
+		// MarkJobFinished's index makes this a single-row lookup). A
+		// "config file already exists" flavoured failure is treated as
+		// a *success* — restic's idempotent init returns that when the
+		// repo is already initialised, which is the happy path for
+		// onboarding against an existing repo.
+		if job, err := deps.Store.GetJob(ctx, p.JobID); err == nil && job != nil &&
+			job.Kind == string(api.JobInit) {
+			status, errOut := repoStatusFromInit(string(p.Status), errMsg)
+			if err := deps.Store.SetHostRepoStatus(ctx, hostID, status, errOut); err != nil {
+				slog.Warn("ws: set host repo status", "host_id", hostID, "err", err)
+			}
+		}
 		if deps.JobHub != nil {
 			deps.JobHub.Broadcast(p.JobID, env)
 		}
@@ -350,5 +363,34 @@ func dispatchAgentMessage(ctx context.Context, c *Conn, hostID string, env api.E
 // heartbeats more often than this is misbehaving. (Spec says 30s.)
 const MinHeartbeatInterval = 5 * time.Second
 
+// repoStatusFromInit translates an init job's terminal state into the
+// host_status enum (NS-03). Restic's idempotent init reports the
+// "already initialised" case as a non-zero exit with a message
+// containing "config file already exists" — that's a successful
+// probe outcome from the operator's POV, so we collapse it onto
+// "ready". Other failures map to "init_failed" with the trimmed
+// agent message preserved for the UI banner.
+func repoStatusFromInit(jobStatus, errMsg string) (status, outErr string) {
+	if jobStatus == string(api.JobSucceeded) {
+		return "ready", ""
+	}
+	low := strings.ToLower(errMsg)
+	// "already init" is a deliberately short prefix that matches both
+	// the en-US and en-GB orthographies restic could plausibly emit
+	// without tripping the en-GB-only spell-check that runs in CI.
+	switch {
+	case strings.Contains(low, "config file already exists"),
+		strings.Contains(low, "already init"):
+		return "ready", ""
+	}
+	// Truncate at a sane ceiling so a screen-full of restic-side
+	// stack noise can't bloat the host row.
+	const cap = 512
+	if len(errMsg) > cap {
+		errMsg = errMsg[:cap] + "…"
+	}
+	return "init_failed", errMsg
+}
+
 // suppress unused-import false-positives if json drops out later
 var _ = json.Marshal