feat(worker-logs): add worker run-log viewer page

Nieuwe /worker-logs pagina: een tabel van de laatste N (10/25/50/100)
worker-runs met een inline detailpaneel dat de stream-json output van
Claude Code als leesbare timeline toont (system-init, assistant-tekst,
tool-calls/results, result-kaart).

- lib/parse-worker-log.ts: pure parser — summarizeRunLog (tabel) +
  parseRunLog (timeline), discriminated-union events, server-side
  truncatie van grote tool-results.
- lib/worker-logs.ts: server-only fs-toegang, leest uit WORKER_LOGS_DIR
  (read-only bind mount), naam-regex + pad-confinement, .gz support.
- app/api/worker-logs[/[name]]: GET-routes, auth-guarded, force-dynamic.
- app/worker-logs: server page + client view (tabel, N-selector,
  auto-refresh) + detail (timeline, auto-refresh tijdens in-progress run).

Vereist een read-only bind mount van /srv/scrum4me/worker-logs in de
ops-dashboard-container (docker-compose.yml + WORKER_LOGS_DIR in .env).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/utils.ts

@@ -14,3 +14,15 @@ export function relativeTime(date: Date): string {
   if (hours < 24) return `${hours}u geleden`
   return `${Math.floor(hours / 24)}d geleden`
 }
+
+/** Human-readable duration from a millisecond count. */
+export function formatDuration(ms: number): string {
+  if (ms < 1000) return `${ms}ms`
+  const totalSec = Math.round(ms / 1000)
+  if (totalSec < 60) return `${totalSec}s`
+  const minutes = Math.floor(totalSec / 60)
+  const seconds = totalSec % 60
+  if (minutes < 60) return `${minutes}m ${seconds}s`
+  const hours = Math.floor(minutes / 60)
+  return `${hours}u ${minutes % 60}m`
+}