Add server mode

Dockerfile

@@ -0,0 +1,33 @@
+FROM node:22-bookworm-slim
+
+# Install Chromium
+RUN apt-get update && apt-get install -y \
+  chromium \
+  unzip \
+  ca-certificates \
+  --no-install-recommends \
+  && rm -rf /var/lib/apt/lists/*
+
+# Tell Puppeteer to use the system Chromium instead of downloading its own
+ENV PUPPETEER_SKIP_BROWSER_DOWNLOAD=true
+ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+# Pre-download the Reader View extension so it works offline at runtime
+RUN node src/download-extension.js
+
+RUN useradd -m appuser && chown -R appuser:appuser /app
+USER appuser
+
+EXPOSE 8080
+
+ENV PORT=8080
+ENV LOG_LEVEL=info
+
+CMD ["node", "src/server.js"]