test(e2e): stand up Playwright — fresh-DB server harness + sign-up helper

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

e2e/serve.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# E2E server: fresh ecomm_e2e database, LogMailer (codes land in .backend.log),
+# backend on :8765 serving the built SPA (the deployed topology, SD-0001 §6.2).
+set -euo pipefail
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+if [ ! -f "$repo_root/frontend/dist/index.html" ]; then
+  ( cd "$repo_root/frontend" && npm run build )
+fi
+
+"$repo_root/.venv/bin/python" - <<'PY'
+import psycopg
+admin = psycopg.connect("postgresql://ecomm:ecomm@localhost:5432/postgres", autocommit=True)
+admin.execute("SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='ecomm_e2e' AND pid <> pg_backend_pid()")
+admin.execute("DROP DATABASE IF EXISTS ecomm_e2e")
+admin.execute("CREATE DATABASE ecomm_e2e")
+PY
+
+export ECOMM_DATABASE_URL="postgresql://ecomm:ecomm@localhost:5432/ecomm_e2e"
+export ECOMM_MAILER=log
+cd "$repo_root/backend"
+exec "$repo_root/.venv/bin/python" -m uvicorn app.main:app --port 8765 \
+  > "$repo_root/e2e/.backend.log" 2>&1