Fix migration workflow: upload as artifact instead of scp to practice EC2

infra/helm/medical-chatbot/values.yaml

@@ -14,9 +14,13 @@ secret:
   create: true
   existingSecret: ""
   postgresPassword: duoc_thu
+  # Set when postgres runs in a different Application/release (the
+  # data/app split pattern) — overrides the default in-release host.
+  postgresHost: ""
   grafanaAdminPassword: change-me
 
 aiService:
+  enabled: true
   replicaCount: 1
   image:
     repository: duocthu-ai-service
@@ -42,6 +46,7 @@ aiService:
     limits: { cpu: "1", memory: 1Gi }
 
 web:
+  enabled: true
   replicaCount: 1
   image:
     repository: duocthu-web