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>

apps/edr-passenger-api/test/setup/prisma.ts

@@ -0,0 +1,26 @@
+/**
+ * Singleton PrismaClient against the hermetic test DB (DATABASE_URL from .env.test, loaded by
+ * setup/load-env.ts). Used by:
+ *   - the fixture seeder (fixtures/seed-core.ts), and
+ *   - "direct-instantiation" specs for services behind the IAM/RabbitMQ wall (BookingsService,
+ *     PaymentsService, WalletService, …) which cannot be booted through their Nest modules because
+ *     those transitively import the @tria-plc IAM stack (ESM-only `file-type`) / golevelup RabbitMQ.
+ *     Those specs `new TheService(prisma, ...mockedCollaborators)` and assert the money logic.
+ */
+import { PrismaClient } from "@prisma/client";
+
+let client: PrismaClient | undefined;
+
+export function getTestPrisma(): PrismaClient {
+  if (!client) {
+    client = new PrismaClient();
+  }
+  return client;
+}
+
+export async function disconnectTestPrisma(): Promise<void> {
+  if (client) {
+    await client.$disconnect();
+    client = undefined;
+  }
+}