feat(dr): Sprint C — Host rsync 備份 + DR SOP 文件

C-1 Velero: 已確認運作中（daily-awoooi-prod schedule, 13d, MinIO Available）

C-2 Host rsync 備份:
  scripts/ops/backup-from-110.sh — 188 每日凌晨 1:00 rsync 備份 110
    - Harbor registry data（最高優先）
    - Gitea repos
    - bitan-pharmacy.git（若存在）
    - 成功寫入 /var/run/backup-110.last_success 供 Prometheus 監控
    - 失敗時 Telegram 告警
  ops/monitoring/alerts-unified.yml — 新增 HostBackupFailed 告警規則

C-3 DR SOP 文件:
  docs/runbooks/disaster-recovery/DR-K8s-awoooi.md  (<15分鐘)
  docs/runbooks/disaster-recovery/DR-Nginx.md        (<5分鐘)
  docs/runbooks/disaster-recovery/DR-Harbor.md       (<30分鐘)
  docs/runbooks/disaster-recovery/DR-Bitan.md        (<5分鐘)
  docs/runbooks/disaster-recovery/DR-Stock.md        (<5分鐘)

部署備份腳本說明 (需手動執行):
  scp scripts/ops/backup-from-110.sh ollama@192.168.0.188:~/bin/backup-from-110.sh
  ssh ollama@192.168.0.188 "chmod +x ~/bin/backup-from-110.sh && mkdir -p /backup/110/{harbor,gitea}"
  ssh ollama@192.168.0.188 "echo '0 1 * * * /home/ollama/bin/backup-from-110.sh' | crontab -"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ops/monitoring/alerts-unified.yml

@@ -156,6 +156,24 @@ groups:
           summary: "Velero 超過 24 小時未成功備份"
           description: "最後一次成功備份超過 24 小時"
 
+      # Sprint C-2 Host rsync 備份告警 (2026-04-11 Claude Sonnet 4.6)
+      # backup-from-110.sh 成功時寫入 /var/run/backup-110.last_success
+      # node-exporter textfile collector 讀取此檔案暴露指標
+      - alert: HostBackupFailed
+        expr: time() - node_textfile_scrape_error{collector="backup_110"} == 0 or absent(node_textfile_scrape_error{collector="backup_110"}) or (time() - backup_110_last_success_timestamp > 90000)
+        for: 10m
+        labels:
+          severity: warning
+          layer: docker-188
+          team: ops
+          component: backup
+          host: "188"
+          auto_repair: "false"
+          alert_category: host_resource
+        annotations:
+          summary: "188 Host 備份超過 25 小時未成功"
+          description: "backup-from-110.sh 可能失敗，/backup/110 資料可能過舊"
+
   # =========================================================================
   # 資料庫告警 (database_alerts)
   # =========================================================================