feat: ship blog platform admin and deploy stack

deploy/scripts/backup/backup-markdown.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SOURCE_DIR="${MARKDOWN_SOURCE_DIR:-./backend/content/posts}"
+BACKUP_DIR="${BACKUP_DIR:-./backups/markdown}"
+RETENTION_DAYS="${RETENTION_DAYS:-30}"
+TIMESTAMP="$(date -u +%Y%m%dT%H%M%SZ)"
+FILE_PATH="${BACKUP_DIR}/markdown-${TIMESTAMP}.tar.gz"
+
+if [[ ! -d "${SOURCE_DIR}" ]]; then
+  echo "Markdown source directory not found: ${SOURCE_DIR}" >&2
+  exit 1
+fi
+
+mkdir -p "${BACKUP_DIR}"
+tar -czf "${FILE_PATH}" -C "${SOURCE_DIR}" .
+ln -sfn "$(basename "${FILE_PATH}")" "${BACKUP_DIR}/latest.tar.gz"
+find "${BACKUP_DIR}" -type f -name 'markdown-*.tar.gz' -mtime +"${RETENTION_DAYS}" -delete
+
+echo "Markdown backup written to ${FILE_PATH}"