fix(e2e): block service workers to prevent route mock bypass

The PWA service worker (VitePWA workbox runtimeCaching) intercepts
/api/* requests, which prevents Playwright's page.route() mocks from
working. This caused the booking flow E2E test to fail because the
availability request was handled by the service worker instead of the
test mock, resulting in real (empty) API responses.

Fixes #65

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/e2e/playwright.config.ts

@@ -22,6 +22,7 @@ export default defineConfig({
     baseURL: "http://localhost:8080",
     trace: "on-first-retry",
     screenshot: "only-on-failure",
+    serviceWorkers: "block",
   },
 
   projects: [