fix: restore consent-tester Dockerfile (was lost from main)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

consent-tester/Dockerfile

@@ -0,0 +1,31 @@
+FROM python:3.12-slim-bookworm
+
+WORKDIR /app
+
+# Install system dependencies for Playwright/Chromium
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libnss3 libnspr4 libatk1.0-0 libatk-bridge2.0-0 libcups2 \
+    libdrm2 libxkbcommon0 libxcomposite1 libxdamage1 libxfixes3 \
+    libxrandr2 libgbm1 libpango-1.0-0 libcairo2 libasound2 \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create user BEFORE installing Playwright (so browsers are in user's cache)
+RUN useradd --create-home appuser
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Install Playwright browsers AS appuser (so they land in /home/appuser/.cache/)
+USER appuser
+RUN playwright install chromium
+USER root
+
+COPY . .
+RUN chown -R appuser:appuser /app
+
+USER appuser
+
+EXPOSE 8094
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8094"]