Add Dockerfile and dockerignore for HF Space

.dockerignore

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+.git
+__pycache__/
+*.py[cod]
+*.db
+uploads/
+vm_state/

Dockerfile

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+# Use official Python runtime as a parent image
+FROM python:3.11-slim
+
+# Ensure stdout/stderr logs are shown in real time
+ENV PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+# Install any system dependencies if required
+RUN apt-get update && apt-get install -y --no-install-recommends git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Install Python dependencies first for better cache utilisation
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application code
+COPY . .
+
+# Expose Gradio default port (HuggingFace sets $PORT automatically)
+EXPOSE 7860
+
+# Start the Gradio application
+CMD ["python", "app.py"]