fix(portal-bff): use bracket notation for process.env access

The strict-TS option noPropertyAccessFromIndexSignature: true (set in
tsconfig.base.json per ADR-0004) forbids dot-notation access on index
signatures. process.env is typed as { [key: string]: string | undefined }
so process.env.PORT must be written process.env['PORT']. The Nx
generator wrote the dot form by default; fix to comply with the
project's strict-TS bar.

Touched: portal-bff main.ts and the three portal-bff-e2e support files
(global-setup, global-teardown, test-setup).

apps/portal-bff-e2e/src/support/global-setup.ts

@@ -7,8 +7,8 @@ module.exports = async function () {
   // Start services that that the app needs to run (e.g. database, docker-compose, etc.).
   console.log('\nSetting up...\n');
 
-  const host = process.env.HOST ?? 'localhost';
-  const port = process.env.PORT ? Number(process.env.PORT) : 3000;
+  const host = process.env['HOST'] ?? 'localhost';
+  const port = process.env['PORT'] ? Number(process.env['PORT']) : 3000;
   await waitForPortOpen(port, { host });
 
   // Hint: Use `globalThis` to pass variables to global teardown.

apps/portal-bff-e2e/src/support/global-teardown.ts

@@ -4,7 +4,7 @@ import { killPort } from '@nx/node/utils';
 module.exports = async function () {
   // Put clean up logic here (e.g. stopping services, docker-compose, etc.).
   // Hint: `globalThis` is shared between setup and teardown.
-  const port = process.env.PORT ? Number(process.env.PORT) : 3000;
+  const port = process.env['PORT'] ? Number(process.env['PORT']) : 3000;
   await killPort(port);
   console.log(globalThis.__TEARDOWN_MESSAGE__);
 };

apps/portal-bff-e2e/src/support/test-setup.ts

@@ -3,7 +3,7 @@ import axios from 'axios';
 
 module.exports = async function () {
   // Configure axios for tests to use.
-  const host = process.env.HOST ?? 'localhost';
-  const port = process.env.PORT ?? '3000';
+  const host = process.env['HOST'] ?? 'localhost';
+  const port = process.env['PORT'] ?? '3000';
   axios.defaults.baseURL = `http://${host}:${port}`;
 };