Update src/prompts/system_prompt_voice.md

Update src/prompts/system_prompt_text.md

use different prompts for voice and text conversations

add system prompt for voice to voice conversation

rename system prompt file name

Add pytz dependency and enhance meeting time handling with timezone support

Refactor Dockerfile and clean up unused schemas; update Redis client initialization and environment configuration

Fix typo in system prompt and add detailed instructions for using tools related to meeting scheduling

Add system prompt for Olivia assistant and refactor OpenAI client to load prompt dynamically