Fix SSE route dependency and align architecture docs

backend/app/workflows/__init__.py

@@ -1,5 +1,9 @@
+"""Initialize the app.workflows package."""
+
 from .rag_workflow import RagState, rag_workflow, run_rag_workflow, stream_rag_workflow
 from .compliance_workflow import ComplianceState, compliance_workflow, run_compliance_workflow
+# Keep package boundaries explicit so backend imports stay predictable.
+
 
 __all__ = [
     "RagState",