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.

docker-compose.yml

@@ -1,20 +1,8 @@
-version: '3.8'
+version: "3.9"
 
 services:
-  vndb-bot:
+  bot:
     build: .
-    container_name: vndb-telegram-bot
-    restart: unless-stopped
-    environment:
-      - TELEGRAM_BOT_TOKEN=${TELEGRAM_BOT_TOKEN}
-      - VNDB_TOKEN=${VNDB_TOKEN:-}
-      - LOG_LEVEL=INFO
-      - USE_SANDBOX=false
-    volumes:
-      - ./logs:/app/logs
-    networks:
-      - bot-network
-
-networks:
-  bot-network:
-    driver: bridge
+    restart: always
+    env_file:
+      - .env