fix: add opencv-python-headless to dev deps and libportaudio2 to CI

The test import chain (conftest → storage → filters → cv2) requires
opencv-python-headless. Also install libportaudio2 for sounddevice.

.gitea/workflows/test.yml

@@ -18,6 +18,11 @@ jobs:
         with:
           python-version: '3.11'
 
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends libportaudio2
+
       - name: Install dependencies
         working-directory: server
         run: |

server/pyproject.toml

@@ -56,6 +56,7 @@ dev = [
     "respx>=0.21.1",
     "black>=24.0.0",
     "ruff>=0.6.0",
+    "opencv-python-headless>=4.8.0",
 ]
 camera = [
     "opencv-python-headless>=4.8.0",