fix(ci): serialize integration suites sharing a database

.gitea/workflows/ci-db.yml

@@ -71,7 +71,9 @@ jobs:
           done
       - name: Go — миграции и запросы store
         working-directory: services/api
-        run: go test -tags integration -count=1 -v ./internal/dbtest/ ./internal/social/
+        # These suites share one database; dbtest also rolls all migrations down
+        # and cleans orphan catalog rows. Do not run the packages concurrently.
+        run: go test -p 1 -tags integration -count=1 -v ./internal/dbtest/ ./internal/social/
       - name: Go — сквозной сценарий пользователя (newApp на Postgres, Redis, Meilisearch)
         working-directory: services/api
         run: go test -tags integration -count=1 -v -run TestUserJourney ./cmd/api/