feat: add Nemotron ASR backend for speech transcription and update persona skills to include Japanese teaching

refactor: rename searxng file reference and clarify persona emoji requirements

refactor: scope memory management and system prompts to individual user_id sessions throughout the chat pipeline

refactor: optimize token streaming logic in llm.py for improved response latency

Add tool call jinja

Switch to Ministral3-8B model

Add debug print

fix: add ddgs to Modal image pip_install

feat: add Modal search endpoint

Modal backend to inference LLM

Add Modal backend to inference LLM