Add SaaS AI engine (#5907)

engine/Dockerfile.dev

@@ -0,0 +1,59 @@
+# syntax=docker/dockerfile:1.5
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim
+
+# Install system deps: Node.js + Puppeteer/Chromium runtime libraries
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+    apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+      ca-certificates \
+      poppler-utils \
+      nodejs \
+      npm \
+      # Fonts for correct text rendering in generated PDFs
+      fonts-liberation \
+      fonts-dejavu-core \
+      # Chromium headless runtime deps
+      libnss3 \
+      libatk1.0-0 \
+      libatk-bridge2.0-0 \
+      libcups2 \
+      libxkbcommon0 \
+      libxcomposite1 \
+      libxdamage1 \
+      libxrandr2 \
+      libpango-1.0-0 \
+      libcairo2 \
+      libasound2 \
+      libx11-6 \
+      libxext6 \
+      libxfixes3 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Install Node dependencies (Puppeteer) first for layer caching
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Copy only pyproject.toml and uv.lock first for dependency caching
+COPY pyproject.toml uv.lock ./
+
+# Install dependencies including dev extras
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv sync --frozen
+
+# Create output directories
+RUN mkdir -p /app/output /app/data
+
+# Expose port
+EXPOSE 5001
+
+# Set environment for Flask development
+ENV FLASK_ENV=development
+ENV FLASK_DEBUG=1
+ENV PYTHONUNBUFFERED=1
+
+# Run the Flask app with hot reload
+# Note: src/ will be mounted as a volume at runtime
+WORKDIR /app/src
+CMD ["uv", "run", "python", "app.py"]