Update Dockerfile

Dockerfile

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+# Dockerfile
+FROM python:3.9-slim
+
+# Install system dependencies (FFmpeg + build tools)
+RUN apt-get update && apt-get install -y \
+    ffmpeg \
+    build-essential \
+    python3-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Install Python packages (prefer wheels)
+COPY requirements.txt .
+RUN pip install --no-cache-dir --prefer-binary -r requirements.txt
+
+COPY . .
+
+CMD ["python", "app.py"]