Add Seafile backup script with Zabbix monitoring

- backup.sh: mysqldump all 3 DBs + rsync seafile-data, runs every 3 days
  via root crontab, keeps last 5 backups in /mnt/backups/seafile
- Notifies Zabbix trapper item seafile.backup.ts (id 70369) on AgapHost

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

seafile/backup.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# Seafile backup script.
+# Backs up MySQL databases and seafile data directory.
+# Runs every 3 days via root crontab. Keeps last 5 backups.
+# Notifies Zabbix (item seafile.backup.ts, id 70369 on AgapHost) after success.
+
+set -euo pipefail
+
+BACKUP_DIR="/mnt/backups/seafile"
+DATA_DIR="/mnt/misc/seafile"
+DATE=$(date '+%Y%m%d-%H%M')
+DEST="$BACKUP_DIR/$DATE"
+
+mkdir -p "$DEST"
+
+# Dump all three Seafile databases from the running container
+for DB in ccnet_db seafile_db seahub_db; do
+  docker exec seafile-mysql mysqldump \
+    -u seafile -pFWsYYeZa15ro6x \
+    --single-transaction "$DB" > "$DEST/${DB}.sql"
+  echo "Dumped: $DB"
+done
+
+# Copy seafile data (libraries, config — excludes mysql and caddy dirs)
+rsync -a --delete \
+  --exclude='seafile-mysql/' \
+  --exclude='seafile-caddy/' \
+  "$DATA_DIR/" "$DEST/data/"
+
+echo "$(date): Backup complete: $DEST"
+ls "$DEST/"
+
+# Notify Zabbix
+if [[ -f /root/.zabbix_token ]]; then
+  ZABBIX_TOKEN=$(cat /root/.zabbix_token)
+  curl -s -X POST http://localhost:81/api_jsonrpc.php \
+    -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $ZABBIX_TOKEN" \
+    -d "{\"jsonrpc\":\"2.0\",\"method\":\"history.push\",\"id\":1,\"params\":{\"itemid\":\"70369\",\"value\":\"$(date '+%Y-%m-%d %H:%M')\"}}" > /dev/null \
+    && echo "Zabbix notified."
+fi
+
+# Rotate: keep last 5 backups
+ls -1dt "$BACKUP_DIR"/[0-9]*-[0-9]* 2>/dev/null | tail -n +6 | xargs -r rm -rf