feat(monitor): 1 分钟采集 + 连续 N 次异常才告警(去抖)

避免瞬时尖峰/部署窗口误报(此前 sing-box 部署期 activating 触发了一次误报)。
- 采集间隔 5min → 1min(MONITOR_INTERVAL_MIN=1)
- 新增 MONITOR_BREACH_RUNS=5:连续 5 次采样都异常才告警一次(状态存
  /var/lib/pangolin-monitor/breach_count);恢复后发一条恢复通知并清零
- 去掉 MONITOR_SEND_OK_PULSE(被去抖逻辑取代)
- 已在 racknerd 验证:连 4 次异常不报、恢复清零

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

deploy/bootstrap/init.sh

@@ -34,13 +34,13 @@ FW_ALLOW_UDP="443"
 TELEGRAM_BOT_TOKEN=""
 TELEGRAM_CHAT_ID=""
 NODE_NAME="$(hostname)"
-MONITOR_INTERVAL_MIN=5
+MONITOR_INTERVAL_MIN=1
+MONITOR_BREACH_RUNS=5
 CPU_ALERT_PCT=80
 MEM_ALERT_PCT=80
 DISK_ALERT_PCT=80
 MONITOR_UNITS="sing-box pangolin-agent"
 MONITOR_NET_PROBE="https://www.cloudflare.com/cdn-cgi/trace"
-MONITOR_SEND_OK_PULSE=false
 
 if [ -f "$SCRIPT_DIR/bootstrap.env" ]; then
   log "读取配置 $SCRIPT_DIR/bootstrap.env"
@@ -199,7 +199,7 @@ MEM_ALERT_PCT=${MEM_ALERT_PCT}
 DISK_ALERT_PCT=${DISK_ALERT_PCT}
 MONITOR_UNITS="${MONITOR_UNITS}"
 MONITOR_NET_PROBE="${MONITOR_NET_PROBE}"
-MONITOR_SEND_OK_PULSE=${MONITOR_SEND_OK_PULSE}
+MONITOR_BREACH_RUNS=${MONITOR_BREACH_RUNS}
 MENV
   umask 022
   sed -e "s/__INTERVAL__/${MONITOR_INTERVAL_MIN}/g" \
@@ -207,7 +207,7 @@ MENV
   install -m 644 "$SCRIPT_DIR/monitor/pangolin-monitor.service" /etc/systemd/system/pangolin-monitor.service
   systemctl daemon-reload
   systemctl enable --now pangolin-monitor.timer >/dev/null
-  log "    监控已装:每 ${MONITOR_INTERVAL_MIN} 分钟上报;发送一条启动通知"
+  log "    监控已装:每 ${MONITOR_INTERVAL_MIN} 分钟采集,连续 ${MONITOR_BREACH_RUNS} 次异常才告警;发送一条启动通知"
   /usr/local/bin/pangolin-monitor --boot || true
 }