wip(handoff): restore backend suite to green

Co-Authored-By: Codex <noreply@openai.com>

backend/Dockerfile.dev

@@ -5,6 +5,12 @@ WORKDIR /app
 RUN apt-get update && apt-get install -y \
     gcc \
     libpq-dev \
+    libpango1.0-dev \
+    libcairo2-dev \
+    libgdk-pixbuf-2.0-dev \
+    libffi-dev \
+    libjpeg-dev \
+    zlib1g-dev \
     && rm -rf /var/lib/apt/lists/*
 
 COPY requirements.txt requirements-dev.txt ./
@@ -12,4 +18,4 @@ RUN pip install --no-cache-dir -r requirements-dev.txt
 
 EXPOSE 8000
 
-CMD [ "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload" ]
+CMD [ "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload" ]