- http.Server with ReadHeaderTimeout/IdleTimeout (no read/write timeouts: /stream/ is long-lived)
- shared outbound clients: providerHTTPClient (5m), apiHTTPClient (30s), imgcache client (30s)
- imgcache: download outside the lock, per-item helper, cache URL uses the file name not the fs path
- writeFileAtomic (temp + fsync + rename) for settings/xepg/pms/urls/authentication JSON
- one package-level logMu for WebScreenLog and notifications; ring buffer keeps the newest lines
- notifications evict the oldest instead of random map entries
- xepg XMLTV file removal rebuilt after the loop; data.go range-mutation removed
- API handler returns after error body; WS request/response fresh per command
- checked type assertions in data/backup/provider/screen
- SIGINT/SIGTERM handled in main via src.Shutdown(); fatal paths exit 1
