varaverk: replace User Scripts dependency with native job tracking

run_job.sh: new wrapper called by scheduler cron for every job.
  Writes /var/log/varaverk/<id>.json (status/start/end/exit/pid)
  and /var/log/varaverk/<id>.log (latest run output, overwritten).
  Maps exit 0→ok, 1→warn, 2+→error so watchdog "took action" runs
  show warn not error.

scheduler: cron now calls bash run_job.sh instead of inline bash -c.
  Added vv_job_stat_path(). LOG_DIR moved to config.php (shared).

monitor: vv_scripts_status() now reads /var/log/varaverk/*.json and
  */*.json — no User Scripts tmpScripts dependency at all.
  Stale running detection via /proc/<pid> check.
  Returns error_count in addition to running/ok/warn counts.

pages/monitor.php: added error pill (red ✗), error icon/color in
  list, duration shown next to age for each script entry.

Plugin/usr/local/emhttp/plugins/varaverk/run_job.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# Varaverk job runner — wraps script execution with JSON status tracking.
+# Called by /etc/cron.d/varaverk for every scheduled job.
+#
+# Usage: bash run_job.sh <job_id> <script_path> [flags...]
+#
+# Writes: /var/log/varaverk/<id>.json — status, timestamps, exit code, pid
+#         /var/log/varaverk/<id>.log  — latest run output (overwritten each run)
+#
+# Status values: running → ok (exit 0) | warn (exit 1) | error (exit 2+)
+
+JOB_ID="$1"
+SCRIPT="$2"
+shift 2
+
+LOG_DIR="/var/log/varaverk"
+BASE="${JOB_ID%.sh}"
+LOG_FILE="$LOG_DIR/$BASE.log"
+STAT_FILE="$LOG_DIR/$BASE.json"
+
+mkdir -p "$(dirname "$LOG_FILE")" "$(dirname "$STAT_FILE")"
+
+START=$(date +%s)
+printf '{"id":"%s","status":"running","start":%s,"pid":%s}\n' \
+    "$JOB_ID" "$START" "$$" > "$STAT_FILE"
+
+bash "$SCRIPT" "$@" > "$LOG_FILE" 2>&1
+EC=$?
+
+END=$(date +%s)
+if   [ "$EC" -eq 0 ]; then STATUS="ok"
+elif [ "$EC" -eq 1 ]; then STATUS="warn"
+else                        STATUS="error"
+fi
+
+printf '{"id":"%s","status":"%s","start":%s,"end":%s,"exit":%s}\n' \
+    "$JOB_ID" "$STATUS" "$START" "$END" "$EC" > "$STAT_FILE"
+
+exit $EC