feat: Implement LLM and scheduler modules

- Implement `llm.py` with OpenAI API integration for smart responses.
- Implement `scheduler.py` to send a daily summary to the bot owner using `python-telegram-bot`'s `JobQueue`.
- Integrate the scheduler into the main application.
- Add `pytz` as a new dependency.
- Update `tasks.md` to mark all tasks as complete.

requirements.txt

@@ -5,3 +5,4 @@ google-api-python-client
 google-auth-httplib2
 google-auth-oauthlib
 openai
+pytz