refactor: add Redis service to CircleCI for E2E tests

- Added Redis container to samples job in CircleCI config
- Removed all mocking from E2E tests to use real Bull queue
- Updated app.module.ts to support environment-based Redis config
- Fixed test routes to match controller (POST /audio/transcode)
- Updated jest-e2e.json with proper timeout and exit settings
- Tests now perform true integration testing with real Redis

.circleci/config.yml

@@ -169,8 +169,12 @@ jobs:
     working_directory: ~/nest
     docker:
       - image: cimg/node:<< pipeline.parameters.maintenance-node-version >>
+      - image: redis:7-alpine
+        name: redis
     environment:
       DISABLE_OPENCOLLECTIVE: 'true'
+      REDIS_HOST: redis
+      REDIS_PORT: 6379
     steps:
       - checkout
       - *restore-cache
@@ -179,6 +183,7 @@ jobs:
           name: Build all samples
           command: npm run build:samples
 
+
 workflows:
   build-and-test:
     jobs:
@@ -204,3 +209,4 @@ workflows:
       - samples:
           requires:
             - build
+