Include frontend in Docker build context

.dockerignore

@@ -85,8 +85,8 @@ scripts/
 # -----------------------------------------------------------------------------
 # Frontend
 # -----------------------------------------------------------------------------
-# Next.js frontend has its own Dockerfile
-frontend/
+# Frontend is included - needed for combined Dockerfile build
+# frontend/  # DO NOT exclude - required for multi-stage build
 
 # -----------------------------------------------------------------------------
 # Documentation and Project Files