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.

Dockerfile

@@ -1,20 +1,10 @@
-FROM python:3.11-slim
+FROM python:3.12-slim
 
 WORKDIR /app
 
-# Install dependencies
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Copy application files
 COPY . .
 
-# Copy environment file (or use docker secrets/environment variables)
-# COPY .env .
-
-# Create non-root user for security
-RUN useradd -m -u 1000 botuser && chown -R botuser:botuser /app
-USER botuser
-
-# Run the bot
-CMD ["python", "bot.py"]
+CMD ["python", "bot.py"]