Add encrypted backup script and security/incident response policy

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

SECURITY.md

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+# Offerlyst security and incident response policy
+
+Owner: Metatroncube Software Solutions · Contact: info@metatroncubesolutions.com · Last reviewed: 2026-10-14
+
+## Data we hold
+Shop settings, offers, and for analytics: order ID (keyed hash + AES-256-GCM), order number (AES-256-GCM),
+order total and discount. No customer names, emails, phone numbers or addresses.
+
+## Access control
+- Production access (VPS, database, Shopify Partner/Dev Dashboard) is limited to named staff who need it.
+- SSH uses key-based login; Shopify and Git accounts use strong unique passwords and two-factor authentication.
+- Secrets (`.env`: Shopify secret, database password, `DATA_ENCRYPTION_KEY`) live only on the server and in the
+  team password manager, never in Git or chat. Rotate them when someone with access leaves.
+- Access is reviewed every quarter.
+
+## Data protection
+- In transit: HTTPS only (TLS at Nginx). At rest: order identifiers encrypted in the database; nightly backups
+  encrypted with AES-256 (`scripts/backup.sh`), kept 14 days.
+- Test and production are separate: development uses local databases and Shopify development stores.
+- Shop data is deleted 48 hours after uninstall (`shop/redact`).
+
+## Incident response
+1. **Detect and contain** (immediately): revoke exposed credentials, rotate secrets, block the access path,
+   take the affected service offline if needed.
+2. **Assess** (within 24 h): what data, which shops, how many records, time window. Preserve logs.
+3. **Notify** (within 72 h of becoming aware): affected merchants by email, and Shopify via the Partner
+   support channel; regulators where the law requires it.
+4. **Recover**: fix the root cause, restore from encrypted backups if needed, verify.
+5. **Review** (within 2 weeks): written post-mortem, follow-up actions, update this policy.

scripts/backup.sh

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+#!/bin/sh
+# Encrypted nightly Postgres backup for Offerlyst. Run from the app folder on the VPS.
+# Setup once:  openssl rand -hex 32 > /root/.offerlyst-backup-key && chmod 600 /root/.offerlyst-backup-key
+# Cron (3 am): 0 3 * * * /opt/bundle-offers-app/scripts/backup.sh >> /var/log/offerlyst-backup.log 2>&1
+# Restore:     openssl enc -d -aes-256-cbc -pbkdf2 -pass file:/root/.offerlyst-backup-key -in FILE | gunzip | \
+#              docker compose exec -T db psql -U bundle_offers bundle_offers
+set -eu
+cd "$(dirname "$0")/.."
+KEY=/root/.offerlyst-backup-key
+DIR=/root/backups
+mkdir -p "$DIR"
+chmod 700 "$DIR"
+OUT="$DIR/offerlyst-$(date +%F).sql.gz.enc"
+docker compose exec -T db pg_dump -U bundle_offers bundle_offers | gzip | \
+  openssl enc -aes-256-cbc -pbkdf2 -salt -pass "file:$KEY" -out "$OUT"
+chmod 600 "$OUT"
+# keep 14 days
+find "$DIR" -name 'offerlyst-*.sql.gz.enc' -mtime +14 -delete
+echo "$(date -Is) backup ok: $OUT"