feat(ai): add chromium, xvfb, fonts, and runtime libraries for headless browser automation

Reviewed-on: #30

ai/Dockerfile

@@ -0,0 +1,33 @@
+FROM debian:13.4
+
+# Install system dependencies for Hermes agent with headless browser automation
+# Single RUN layer to minimize image size.
+#   PR #7 base: curl, poppler-utils, imagemagick for document processing
+#   New: chromium + xvfb for headless browser automation
+#   New: fonts for comprehensive Unicode/CJK/emoji coverage
+#   New: runtime libs required by Chromium
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        curl \
+        poppler-utils \
+        imagemagick \
+        chromium \
+        xvfb \
+        fonts-noto-color-emoji fonts-unifont fonts-liberation fonts-ipafont-gothic fonts-wqy-zenhei fonts-tlwg-loma-otf fonts-freefont-ttf \
+        libasound2t64 libatk-bridge2.0-0t64 libatk1.0-0t64 libatspi2.0-0t64 libcairo2 libcups2t64 libdbus-1-3 libdrm2 libgbm1 libglib2.0-0t64 libnspr4 libnss3 libpango-1.0-0 libx11-6 libxcb1 libxcomposite1 libxdamage1 libxext6 libxfixes3 libxkbcommon0 libxrandr2 && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install uv (Python package manager)
+COPY --from=ghcr.io/astral-sh/uv:latest /usr/local/bin/uv /usr/local/bin/uv
+RUN uv --version
+
+# Verify all expected tools are available
+RUN curl --version && \
+    pdftotext -v 2>&1 | head -1 && \
+    pdfinfo -v 2>&1 | head -1 && \
+    pdftoppm -v 2>&1 | head -1 && \
+    convert --version | head -1 && \
+    identify --version | head -1 && \
+    chromium --version
+
+CMD ["/bin/bash"]