refactor: remove unused stub client import from engine dependency factory

Author: Thavarshan

src/clients/index.ts

@@ -38,7 +38,6 @@ import type { AuralyzeEngineDeps } from '@auralyze/engine';
 import { HttpAudioMetadataClient } from './http-audio-metadata-client.ts';
 import { HttpAudioAnalysisClient } from './http-audio-analysis-client.ts';
 import { HttpAudioFeedbackClient } from './http-audio-feedback-client.ts';
-import { createStubDeps } from './stub-clients.ts';
 import type { AppEnv } from '../config/env.ts';
 
 /**