chore: update dependencies

chore: update dependencies for various improvements

fix: ensure prompt is only set if it exists in the cached prompt map

feat: add support for system prompts and enhance command handling in bot

feat: update dependencies to latest versions for improved stability and performance

fix: enhance command handling by introducing utility functions for command detection and extraction

docs: update README to reflect support for images in chat and enhance API compatibility

fix: simplify photo handling by using FileID directly for download

feat: add photo handling and base64 encoding for chat messages

fix: refactor response handling in command processing and add draining logic

fix: update system prompt to include name in Japanese and change 'SHOULD' to 'MUST'

fix: move response stopping logic to before clearing chat records in admin command

fix: add response stopping logic in admin command handler

fix: add index on chat_records for session_id and refactor session deletion logic

fix: set default configuration values