ci(): fixed artifacts path and uv job image

.gitlab-ci.yml

@@ -161,7 +161,7 @@ cache:
       allow_failure: true
 
 .uv-job: &uv-job
-  image: debian:trixie-slim
+  image: docker.io/python:3.13-trixie-slim
   cache:
     key: "${CI_JOB_NAME}-${CI_COMMIT_REF_SLUG}"
     paths:
@@ -218,13 +218,12 @@ test:
     - just ci-test
   artifacts:
     paths:
-      - reports/
-      - .cov/
+      - src/backend/.cov/
     reports:
-      junit: reports/junit.xml
+      junit: src/backend/.cov/junit.xml
       coverage_report:
         coverage_format: cobertura
-        path: .cov/coverage.xml
+        path: src/backend/.cov/coverage.xml
     expire_in: 1 week
     when: always
   coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'