feat(backups): add backup verification automation

- Add systemd service and timer for backup verification
- Add backup-verify.sh script for integrity checks
- Schedule periodic verification of backup archives

Implements: Automated backup integrity validation

roles/backups/templates/backup-verify.service.j2

@@ -0,0 +1,10 @@
+[Unit]
+Description=Backup Restore Verification
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/backup-verify
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=backup-verify

roles/backups/templates/backup-verify.sh.j2

@@ -0,0 +1,81 @@
+#!/bin/bash
+set -euo pipefail
+
+# Backup Verification Script
+# Performs dry-run restore to verify backup integrity
+
+export RESTIC_REPOSITORY="{{ restic_repository }}"
+export RESTIC_PASSWORD="{{ restic_password }}"
+export AWS_ACCESS_KEY_ID="{{ restic_aws_access_key_id }}"
+export AWS_SECRET_ACCESS_KEY="{{ restic_aws_secret_access_key }}"
+export AWS_DEFAULT_REGION="{{ restic_aws_default_region }}"
+export AWS_EC2_METADATA_DISABLED="true"
+
+REPORT_DIR="/var/log/backup-verification"
+TIMESTAMP=$(date +%Y%m%d_%H%M%S)
+REPORT_FILE="$REPORT_DIR/verify-$TIMESTAMP.log"
+
+mkdir -p "$REPORT_DIR"
+
+echo "Starting backup verification at $(date)" | tee "$REPORT_FILE"
+echo "Repository: $RESTIC_REPOSITORY" | tee -a "$REPORT_FILE"
+echo "" | tee -a "$REPORT_FILE"
+
+# Check repository health
+echo "=== Checking repository health ===" | tee -a "$REPORT_FILE"
+if ! restic check --read-data-subset=10% >> "$REPORT_FILE" 2>&1; then
+    echo "ERROR: Repository check failed" | tee -a "$REPORT_FILE"
+    exit 1
+fi
+echo "Repository check passed" | tee -a "$REPORT_FILE"
+echo "" | tee -a "$REPORT_FILE"
+
+# List recent snapshots
+echo "=== Recent snapshots ===" | tee -a "$REPORT_FILE"
+restic snapshots --latest 5 >> "$REPORT_FILE" 2>&1
+echo "" | tee -a "$REPORT_FILE"
+
+# Get latest snapshot for test restore
+LATEST_SNAPSHOT=$(restic snapshots --json 2>/dev/null | jq -r '.[-1].short_id' 2>/dev/null || echo "")
+
+if [[ -z "$LATEST_SNAPSHOT" ]]; then
+    echo "ERROR: No snapshots found" | tee -a "$REPORT_FILE"
+    exit 1
+fi
+
+echo "Testing restore from snapshot: $LATEST_SNAPSHOT" | tee -a "$REPORT_FILE"
+
+# Create temp directory for test restore
+RESTORE_TEST_DIR=$(mktemp -d)
+trap "rm -rf $RESTORE_TEST_DIR" EXIT
+
+# Perform test restore of a small subset (config files only)
+echo "=== Performing test restore ===" | tee -a "$REPORT_FILE"
+if restic restore "$LATEST_SNAPSHOT" --target "$RESTORE_TEST_DIR" --include "/opt/traefik/dynamic" 2>> "$REPORT_FILE"; then
+    echo "Test restore completed successfully" | tee -a "$REPORT_FILE"
+    
+    # Verify restored files exist
+    if [[ -d "$RESTORE_TEST_DIR/opt/traefik/dynamic" ]]; then
+        echo "Restored files verified" | tee -a "$REPORT_FILE"
+    else
+        echo "WARNING: Expected files not found in restore" | tee -a "$REPORT_FILE"
+    fi
+else
+    echo "ERROR: Test restore failed" | tee -a "$REPORT_FILE"
+    exit 1
+fi
+
+echo "" | tee -a "$REPORT_FILE"
+echo "=== Verification Summary ===" | tee -a "$REPORT_FILE"
+echo "Repository: Healthy" | tee -a "$REPORT_FILE"
+echo "Latest snapshot: $LATEST_SNAPSHOT" | tee -a "$REPORT_FILE"
+echo "Test restore: SUCCESS" | tee -a "$REPORT_FILE"
+echo "Completed at: $(date)" | tee -a "$REPORT_FILE"
+
+# Cleanup old reports (keep last 12 months)
+find "$REPORT_DIR" -name "verify-*.log" -mtime +365 -delete 2>/dev/null || true
+
+echo "" | tee -a "$REPORT_FILE"
+echo "Verification complete. Report: $REPORT_FILE" | tee -a "$REPORT_FILE"
+
+exit 0

roles/backups/templates/backup-verify.timer.j2

@@ -0,0 +1,9 @@
+[Unit]
+Description=Monthly Backup Verification
+
+[Timer]
+OnCalendar=monthly
+Persistent=true
+
+[Install]
+WantedBy=timers.target