Add an e2e/ Playwright harness (via @levkin/playkit) that smoke-tests the public DEV host: login page loads, sign-out never redirects to a LAN host, FastAPI /health responds, and forgot-password mail lands in Mailtrap with a public reset link (Kolby #56/#57 regressions). Wire it into Gitea Actions as a new `e2e` job (self-hosted runner, Chromium via Playwright), gated behind the existing skip-ci-check. Add npm root scripts (install:e2e, test:e2e) and gitignore e2e build artifacts (node_modules, reports, .env).