Add deploy/publish.sh redeploy helper + document production split

One command to rebuild the frontend, sync it to the live Caddy site, refresh the
API container, and reload Caddy. README documents the upbeatbytes.com topology.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

deploy/publish.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Publish Upbeat Bytes: build the frontend, sync it to the live Caddy site,
+# rebuild/restart the API container, and reload Caddy. One command to redeploy.
+set -euo pipefail
+
+repo="$(cd "$(dirname "$0")/.." && pwd)"
+site="/home/jay/srv/sites/upbeatbytes"
+api_compose="/home/jay/srv/upbeatbytes/compose.yaml"
+
+echo "→ building frontend"
+( cd "$repo/frontend" && npm run build )
+
+echo "→ syncing static site to $site"
+rsync -a --delete "$repo/frontend/build/" "$site/"
+
+echo "→ rebuilding/refreshing API container"
+docker compose -f "$api_compose" up -d --build
+
+echo "→ reloading Caddy"
+docker exec caddy caddy reload --config /etc/caddy/Caddyfile --adapter caddyfile
+
+echo "✓ Published Upbeat Bytes → https://upbeatbytes.com"