feat(v1): add basic backend and frontend

backend/processing/selectors.py

@@ -0,0 +1,9 @@
+from .models import ImageSession, ProcessingJob
+
+
+def image_session_get(*, session_id):
+    return ImageSession.objects.filter(id=session_id).first()
+
+
+def processing_job_get(*, job_id):
+    return ProcessingJob.objects.filter(id=job_id).first()