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>

hostlogs.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"io"
 	"io/fs"
-	"log"
 	"os"
 	"path/filepath"
 	"sort"
@@ -116,14 +115,18 @@ func (h *HostLogs) saveState() {
 	}
 	h.dirty = false
 	if err := writeJSONFile(h.statePath, h.pos); err != nil {
-		log.Printf("host logs: saving positions: %v", err)
+		logEvent("host", 4, "saving positions: %v", err)
 	}
 }
 
 func (h *HostLogs) setStatus(mode string, files int, code, detail string) {
 	h.mu.Lock()
+	changed := code != h.errCode
 	h.mode, h.files, h.errCode, h.errDetail = mode, files, code, detail
 	h.mu.Unlock()
+	if changed && code != "" && code != "empty" {
+		logEvent("host", 4, "cannot read the host system logs (%s): %s", code, detail)
+	}
 }
 
 // scan reads what was added since the previous poll.