test: add Playwright e2e smoke suite for punimtag dev

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).

package.json

@@ -19,7 +19,9 @@
     "lint:python": "flake8 backend --max-line-length=100 --ignore=E501,W503,W293,E305,F401,F811,W291,W391,E712,W504,F841,E402,F824,E128,E226,F402,F541,E302,E117,E722 || true",
     "lint:python:syntax": "find backend -name '*.py' -exec python -m py_compile {} \\;",
     "test:backend": "export PYTHONPATH=$(pwd) && export SKIP_DEEPFACE_IN_TESTS=1 && ./venv/bin/python3 -m pytest tests/ -v",
+    "test:e2e": "npm test --prefix e2e",
     "test:all": "npm run test:backend",
+    "install:e2e": "npm install --prefix e2e",
     "ci:local": "npm run lint:all && npm run type-check:viewer && npm run lint:python && npm run test:backend && npm run build:all",
     "deploy:dev": "npm run build:all && echo '✅ Build complete. Ready for deployment to dev server (10.0.10.121)'",
     "deploy:dev:prepare": "npm run build:all && mkdir -p deploy/package && cp -r backend deploy/package/ && cp -r admin-frontend/dist deploy/package/admin-frontend-dist && cp -r viewer-frontend/.next deploy/package/viewer-frontend-next && cp requirements.txt deploy/package/ && cp .env.example deploy/package/ && echo '✅ Deployment package prepared in deploy/package/'"