Add job processing system with streaming endpoint

Introduced a `processing` router to handle job streaming using server-sent events. Added `Jobs` and `JobStatus` models for managing job-related data, along with database creation logic. Updated the `sample` router to create new job entries during experiment creation.

.gitlab-ci.yml

@@ -63,6 +63,7 @@ release:
     - echo "Setting up Python dependencies..."
     - source $VIRTUAL_ENV/bin/activate
     - pip install -r requirements.txt
+    - mkdir -p /app/backend/ssl
     - rm -f openapi.json || true
     - rm -rf python-client || true
     - bash make_openapi_client.sh        # Generate OpenAPI client and package