chore(backups): ship exact DB-state dumps + restore scripts

The databases live in Docker volumes (not in git), so teammates on a fresh
boot saw an empty system. backups/procurement.dump + casdoor.dump are exact
pg_dump snapshots of the current demo state (users/roles, projects,
warehouses, quotes with receipts, inventory rows; Casdoor org/app/users);
restore.ps1 / restore.sh replace both DBs with the committed state
(--clean --if-exists, verified by a round-trip restore into throwaway DBs).
README documents how to restore and how to take a fresh dump.

backups/restore.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Restore the committed demo-state dumps (backups/*.dump) into the running
+# stack (Linux/macOS/Git Bash). REPLACES all data in the `procurement` and
+# `casdoor` databases.
+#
+#   bash backups/restore.sh
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+echo "Stopping api + casdoor (they hold DB connections)..."
+docker compose stop api casdoor
+
+echo "Restoring procurement DB..."
+docker cp backups/procurement.dump procurement-postgres:/tmp/procurement.dump
+docker exec procurement-postgres pg_restore -U postgres -d procurement --clean --if-exists --single-transaction /tmp/procurement.dump
+
+echo "Restoring casdoor DB..."
+docker cp backups/casdoor.dump procurement-postgres:/tmp/casdoor.dump
+docker exec procurement-postgres pg_restore -U postgres -d casdoor --clean --if-exists --single-transaction /tmp/casdoor.dump
+
+echo "Starting services..."
+docker compose start casdoor api
+
+echo ""
+echo "Restore complete."
+echo "App      : http://localhost"
+echo "Casdoor  : http://localhost:8080  (admin / 123)"