E2E: test-server.mjs always spins up its own postgres-test container
and publishes port 5432 on the docker host — colliding with Gitea's
core postgres on the QNAP runner. Add PLAYWRIGHT_USE_EXTERNAL_DB
opt-in so CI can reuse the e2epg job-service container (which
test-server still pushes+seeds into). Set the flag in the E2E job.
docker-deploy smoke: install @playwright/test locally (no -g, no
--save) so the CJS require() in apps/web/playwright.ci.config.ts
resolves it by walking up from the config directory. Global npm
install lands in a hostedtoolcache path Node does not search.