feat(e2e): set up isolated Playwright infra + 10 smoke tests (PLAYWRIGHT-P0)
- DB erp_test isolée (ports 3002/5174, erp_local intouché)
- seed-test.ts déterministe: 3 users, 2 clients, 2 suppliers, 2 orders, 59 help articles
- globalSetup truncate+reseed, webServer dual backend+frontend
- 10 smoke tests: login, RBAC, orders, documents, help drawer, Ctrl+/
- Réorganisation tests/: e2e/ (Playwright) vs backend/ (vitest)
- cross-env + dotenv pour portabilité Windows/Linux
- vite.config.ts proxy dynamique via BACKEND_PORT env var
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
louis
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