Add custom Dockerfile with Playwright browser deps

Dockerfile

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+FROM python:3.13
+
+# Install system dependencies for Playwright
+RUN apt-get update && apt-get install -y \
+    git git-lfs ffmpeg libsm6 libxext6 cmake rsync libgl1 \
+    libnss3 libnspr4 libatk1.0-0 libatk-bridge2.0-0 libcups2 libdrm2 \
+    libxkbcommon0 libxcomposite1 libxdamage1 libxfixes3 libxrandr2 \
+    libgbm1 libpango-1.0-0 libcairo2 libasound2 \
+    && rm -rf /var/lib/apt/lists/* \
+    && git lfs install
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir pip -U && \
+    pip install --no-cache-dir \
+    datasets "huggingface-hub>=0.30" "hf-transfer>=0.1.4" "protobuf<4" "click<8.1"
+
+RUN pip install --no-cache-dir -r requirements.txt \
+    gradio[oauth]==4.44.1 "uvicorn>=0.14.0" "websockets>=10.4" spaces
+
+# Install Playwright browsers
+RUN playwright install chromium
+RUN playwright install-deps chromium || true
+
+COPY . .
+
+EXPOSE 7860
+ENV GRADIO_SERVER_NAME=0.0.0.0
+ENV GRADIO_SERVER_PORT=7860
+
+CMD ["python", "app.py"]