chore: relocate backend into apps/api ahead of monorepo merge

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/scripts/garage-init.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# Wraps the Garage daemon: starts it in the background, runs one-time cluster
+# initialization using the local RPC connection, then hands control back to
+# the daemon process. Safe to re-run — all operations are idempotent.
+set -e
+
+garage server &
+DAEMON_PID=$!
+
+echo "Waiting for Garage to be ready..."
+until garage status > /dev/null 2>&1; do
+  sleep 2
+done
+echo "Garage is up. Running cluster initialization..."
+
+NODE_ID=$(garage node id 2>/dev/null | head -1 | awk '{print $1}')
+garage layout assign "$NODE_ID" -z dc1 -c 100G 2>/dev/null || true
+garage layout apply --version 1 2>/dev/null || true
+
+garage bucket create "$S3_BUCKET" 2>/dev/null || true
+
+# --yes skips the interactive confirmation prompt.
+garage key import "$S3_ACCESS_KEY" "$S3_SECRET_KEY" -n starr-app --yes 2>/dev/null || true
+
+garage bucket allow "$S3_BUCKET" --read --write --owner --key "$S3_ACCESS_KEY" 2>/dev/null || true
+
+# Flag file read by the healthcheck — ensures the backend waits for full init.
+touch /var/lib/garage/meta/.ready
+echo "Garage init complete."
+
+wait $DAEMON_PID