Add Docker support (Dockerfile, docker-compose.yml, .dockerignore)

Dockerfile

@@ -0,0 +1,32 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install dependencies
+RUN apt-get update && apt-get install -y \
+    ffmpeg \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy application files
+COPY . .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt 2>/dev/null || pip install --no-cache-dir \
+    flask \
+    requests \
+    gunicorn \
+    m3u8 \
+    pypdl \
+    python-slugify \
+    yt-dlp \
+    2>/dev/null || true
+
+# Create downloads directory
+RUN mkdir -p /app/downloads /app/cookies
+
+# Expose port
+EXPOSE 8770
+
+# Run with gunicorn for production
+CMD ["gunicorn", "--bind", "0.0.0.0:8770", "--workers", "2", "--threads", "4", "app:app"]