add Dockerfile for NegaBot API setup with Python 3.12 and necessary dependencies

Dockerfile

@@ -0,0 +1,34 @@
+# Use Python 3.12 slim image
+FROM python:3.12-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements file first for better build caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Create writable directory for database and cache
+RUN mkdir -p /app/data /app/.cache && chmod -R 777 /app/data /app/.cache
+
+# Set environment variables for Hugging Face cache
+ENV TRANSFORMERS_CACHE=/app/.cache
+ENV HF_HOME=/app/.cache
+ENV PYTHONPATH=/app
+ENV PYTHONUNBUFFERED=1
+
+# Expose API port
+EXPOSE 7860
+
+CMD ["python", "api.py"]