wip(handoff): restore backend suite to green

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

.gitea/workflows/ci.yml

@@ -43,6 +43,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install system dependencies
+        run: |
+          apt-get update
+          apt-get install -y libpango1.0-dev libcairo2-dev libgdk-pixbuf-2.0-dev libffi-dev libjpeg-dev zlib1g-dev
+
       - name: Install dependencies
         run: pip install --break-system-packages -r backend/requirements.txt -r backend/requirements-dev.txt