refactor(core): Architecturally decouple Audio, ASR, and TTS modules

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Remove `speech_monitor` dependency from `asr_worker` service definition.

Add echo cancellation and VAD toggle support in service factories and routes

Refactor to replace `EchoCancellingAudioCapture` with `AudioCapture` across the codebase for improved clarity and flexibility

Replace `logging` with centralized `loguru`-based logger across all modules.

Standardize service lifecycle management by replacing `stop` with `exit` and introducing `is_exited` check

Increase service startup timeouts and set daemon mode for services.

Rename 'src/VoiceDialogue' to 'src/voice_dialogue'.