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

@@ -61,11 +61,11 @@ release:
     TWINE_PASSWORD: $CI_JOB_TOKEN
   script:
     # build and run commands within docker container context
-    - docker-compose build backend
+    - docker compose build backend
 
     # Run commands inside your 'backend' service container
-    - docker-compose run --rm backend mkdir -p /app/backend/ssl
-    - docker-compose run --rm backend bash make_openapi_client.sh
+    - docker compose run --rm backend mkdir -p /app/backend/ssl
+    - docker compose run --rm backend bash make_openapi_client.sh
 
     # After script finishes execution within the container,
     # revert to the runner environment context if needed