dsh-voice-input: DSH Local Voice Input Plugin

The DeepSeek Harness voice input plugin, `dsh-voice-input`, is designed to provide a local, streamlined, and precise speech-to-text experience. It integrates a local Whisper engine, enforces output in Simplified Chinese, and features hallucination prevention, privacy protection, optimization for users in China, and high performance. On first use after installation, it automatically downloads a model of approximately 500 MB. It supports click-to-record transcription via the microphone icon and also allows switching to a cloud API. It is suitable for users who find typing inconvenient or who prioritize privacy.