Fix CI/CD deploy: don't recreate the runner during deploy

docker compose up -d was recreating act_runner, killing the job
mid-execution. Explicitly target db, backend, frontend only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -49,7 +49,7 @@ jobs:
             -w /deploy \
             docker:27-cli sh -c "
               docker compose -p umbra pull backend frontend &&
-              docker compose -p umbra up -d --remove-orphans
+              docker compose -p umbra up -d db backend frontend
             "
 
       - name: Health check