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.

backend/make_openapi_client.sh

@@ -15,7 +15,7 @@ echo "Using project name: $NAME"
 echo "Using version: $VERSION"
 
 # Navigate to backend directory
-cd "$(dirname "$0")/backend" || exit
+cd "/app/backend" || exit
 
 # Generate OpenAPI JSON file
 echo "Generating OpenAPI JSON..."
@@ -46,7 +46,7 @@ fi
 # Build the package
 cd python-client || exit
 python3 -m venv .venv
-source .venv/bin/activate
+source /app/.venv/bin/activate
 pip install -U pip build
 python3 -m build