Sync project metadata with pyproject.toml

Updated scripts and backend to dynamically retrieve project name and version from `pyproject.toml`. This ensures consistent metadata across the OpenAPI client generation and the FastAPI application.

.gitlab-ci.yml

@@ -24,6 +24,7 @@ test:
     - source $VIRTUAL_ENV/bin/activate
     - pip install -r requirements.txt
     - export PYTHONPATH=$PYTHONPATH:/home/gitlab-runner/builds/t3_38ooWt/0/mx/heidi-v2/backend
+    - cd /home/gitlab-runner/builds/t3_38ooWt/0/mx/heidi-v2  # Change to the project root
     - pytest --cov=app --cov-report=xml  # Run tests and generate coverage report
 
 lint: