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

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Extract values from pyproject.toml
-PYPROJECT_FILE="$(dirname "$0")/backend/pyproject.toml"
+PYPROJECT_FILE="/app/backend/pyproject.toml"
 
 NAME=$(awk -F'= ' '/^name/ { print $2 }' "$PYPROJECT_FILE" | tr -d '"')
 VERSION=$(awk -F'= ' '/^version/ { print $2 }' "$PYPROJECT_FILE" | tr -d '"')