refine handling of unknown questions by improving user follow-up prompts and notification logic

optimize unknown question flow

optimize unknown question flow

optimize unknown question handling

optimize system prompt and remove network self test

add dynamic routing and change answer model to gpt-4.1-mini

fix double telegram notification

Update implementation/chat.py

Update implementation/chat.py

fix self test 2

fix self test

test cloudflare worker

use cloudflare worker to send telegram notification

added logging to telegram feature

Add retry logic to Telegram notification

Enhance send_telegram_notification function in chat.py to implement retry logic for failed requests, improving reliability of Telegram notifications.

fix app.py

optimize chat.py

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