test: add EDR passenger pricing/config E2E bug-hunt harness

Hermetic E2E harness targeting pricing integrity and backoffice config:
- e2e/ docker Postgres (5544) + prepare.sh/run.sh one-command runner + HTML report
- 6 suites / 23 tests reproducing pricing, FX, wallet, refund, config and auth
  defects (see docs/ISSUES.md); docs/e2e-test-matrix.md documents the matrix
- two-tier harness (slim module boot + direct service instantiation) to work
  around the IAM/RabbitMQ/file-type boot wall
- .env.test.example tracked; loader falls back to it for fresh checkouts

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -18,6 +18,7 @@
     "build:passenger": "turbo run build --filter=@edr/passenger-api... --filter=@edr/passenger-portal... --filter=@edr/passenger-backoffice...",
     "clean": "find . -type d -name dist -prune -exec rm -rf '{}' + && find . -type f -name '*.tsbuildinfo' -delete",
     "test": "turbo run test",
+    "test:e2e:passenger": "bash e2e/run.sh",
     "lint": "turbo run lint",
     "type-check": "turbo run type-check",
     "format": "prettier --write \"**/*.{ts,tsx,json,md}\"",