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[2025-12-04T08:00:17.940Z]
Cherry-pick/merge text-to-speech (TTS) and speech-to-text (STT) related code from branch `c-agent-embedding` to the current branch `vpcp-embedding`.

**Task:**
1. First, check current branch to confirm we're on `vpcp-embedding`
2. Examine the `c-agent-embedding` branch to identify all code related to:
   - Text-to-speech (TTS) functionality - converting text responses to audio output
   - Speech-to-text (STT) functionality - converting voice input to text
   - Audio recording and playback
   - Voice synthesis
   - Any API integrations for speech services
3. Compare what TTS/STT features exist in `c-agent-embedding` but not in `vpcp-embedding`
4. Carefully merge/cherry-pick only the TTS and STT related code changes to the current branch

**Definition of Done:**
- All TTS and STT code from `c-agent-embedding` is successfully integrated into `vpcp-embedding` branch
- No unrelated code changes are included
- The code compiles without errors
- Run lint-fix and type-check to ensure code quality

Do not create or modify any markdown document files or code examples.