Feat: Remove quiz mode - generate regular questions without correct answers

UI: Update /start welcome message to English with user-provided copy

Feat: Clear chat history from database on /start command

Chore: Update system prompts to be more strict and authoritative (Pro version)

Feat: Make chat context smarter with personalization and character-based history pruning

Feat: Add PostgreSQL-backed chat memory using Neon DB

Feat: Add conversational chat mode for short messages using LLM

Fix: Initialize asyncio event loop in background thread to prevent RuntimeError in ApplicationBuilder

Fix: Disable PTB signal handling for thread safety and enable unbuffered logs

Fix: Handle full URL in file_path to prevent double-URL construction in proxy download

Fix: Manually construct file download URL to use proxy for getFile content

Fix: Add debugging for OLLAMA_HOST and multi-target network check

Fix: Configure custom Telegram API proxy (telegram.esmail.app) to bypass HF Spaces blocking

Fix: Update DNS resolution in network wait function to use new Telegram API endpoint

Fix: Switch to full python image and add network wait loop to solve DNS race conditions

Fix: Increase connection timeout and pool size for HF Spaces reliability

Add AI Quiz Bot files