Refactor VNDB Telegram Bot

- Remove config.py and integrate environment variable handling directly in docker-compose.yml.
- Delete detailed_handlers.py and replace with simplified command handlers.
- Update requirements.txt to use aiogram and httpx instead of python-telegram-bot and requests.
- Remove test_bot.py and utils.py, consolidating functionality into new VNDBClient class.
- Implement VNDBClient for API interactions, simplifying query methods for visual novels, characters, and releases.
- Clean up docker-compose.yml for improved readability and maintainability.

.env.example

@@ -1,13 +1,2 @@
-# Telegram Bot Token (обязательно)
-# Получите у @BotFather в Telegram
-TELEGRAM_BOT_TOKEN=your_telegram_bot_token_here
-
-# VNDB API Token (опционально)
-# Получите на https://vndb.org/u/tokens
-VNDB_TOKEN=your_vndb_api_token_here
-
-# Опции логирования
-LOG_LEVEL=INFO
-
-# Использовать sandbox API (для тестирования)
-USE_SANDBOX=false
+TELEGRAM_TOKEN=your_token_here
+VNDB_API_URL=https://api.vndb.org/kana