Linux audit (auditd) source and LogStream internal logs

Audit source (source_type=audit), off until enabled in Settings > Sources:
- follows /var/log/audit/audit.log (path configurable, AUDIT_LOG), with
  rotation (end of audit.log.1 read first) and an offset checkpoint in
  /data/audit-state.json; last AUDIT_BACKFILL (1h) read on first enable
- groups the records of an event by msg=audit(time:serial), closed on EOE,
  after 2 s without a record, or once the log has moved 2 s past it
- fields audit_type, audit_serial, auid, user (enriched name, host
  /etc/passwd or uid), exe, res, key, audit_raw; app = audit_type, host =
  node= / AUDIT_HOST / /host/etc/hostname; summary "who: what [key] →
  result"; warning when res=failed / success=no, info otherwise
- hexadecimal values (proctitle, cmd, exec arguments…) decoded

Internal logs (source_type=logstream, host=logstream, app=component):
- logEvent() for VictoriaLogs unreachable / back, lost batches, spooled
  batches refused, syslog listener errors, Docker API and container
  streams lost, failing sources, start and stop
- on by default from warning; switch and minimum level in Settings >
  Sources (/data/selflog.json)
- bounded queue, never waits for the Store, same event at most once per
  30 s with a count of the repeats: a failing Store cannot loop

UI: violet (audit) and turquoise (LogStream) left edge and tint, AUDIT /
LS badge before the app, raw audit record under the summary (folded in
compact density until the row is opened), Audit and LogStream in the
source filter, FR/EN translations. docker-compose: optional
/var/log/audit, /etc/passwd and /etc/hostname mounts. README (EN/FR):
host prerequisites (log_group, ACL for UID 10001).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.env.example

@@ -60,3 +60,10 @@ HOST_LOGS_BACKFILL=1h
 # or run the container as root with the SYSLOG capability ("user" and "cap_add" in docker-compose.yml).
 # History read when the source is turned on (e.g. 30m, 1h, 24h; 0 = only new messages)
 DMESG_BACKFILL=1h
+# Linux audit log of the host (auditd, enable it in Settings > Sources). Uncomment the
+# /var/log/audit volume in docker-compose.yml and let the container read the file:
+# log_group = adm in /etc/audit/auditd.conf, and chgrp adm + chmod 750 on /var/log/audit.
+# History read when the source is turned on (e.g. 30m, 1h, 24h; 0 = only new events)
+AUDIT_BACKFILL=1h
+# Host name of the audit events (empty: node= of the records, else /host/etc/hostname, else localhost)
+AUDIT_HOST=