* fix(notifications): replace polling with Docker event stream for container lifecycle detection
Replaces the 30-second MonitorService crash-detection poll with a causal,
per-node Docker events stream. Eliminates false crash alerts on intentional
stops (docker stop, compose down, stack restart/update), detects OOM kills
as a distinct alert category, and surfaces real crashes in real time.
A new DockerEventManager spawns one DockerEventService per local node. Each
service consumes the filtered container event stream, classifies die events
against recent kill/oom state, and reconciles container state via snapshot
diffing on connect and reconnect. Rate limiting, exponential backoff with
jitter, and parse-error tolerance keep the stream resilient under load and
during daemon interruptions.
MonitorService retains host limits, janitor, version check, and stack metric
alerts; crash and healthcheck detection move out entirely.
* fix(tests): silence require-imports lint in hoisted mock factory
Anso