Rename Helm chart to api7ee-demo-k8s

- Changed chart name from api7ee to api7ee-demo-k8s in Chart.yaml
- Renamed helm/api7ee directory to helm/api7ee-demo-k8s
- Updated all references in build.yml workflow
- Updated all references in helm-release.yml workflow
- Updated main README.md with new chart name
- Updated Helm chart README with new chart name
- Verified all old references have been replaced
- Chart packages correctly as api7ee-demo-k8s-{version}.tgz

helm/api7ee-demo-k8s/Chart.yaml

@@ -1,5 +1,5 @@
 apiVersion: v2
-name: api7ee
+name: api7ee-demo-k8s
 description: A Helm chart for API7 Enterprise Edition demo application
 type: application
 version: 0.1.0

helm/api7ee-demo-k8s/README.md

@@ -22,13 +22,13 @@ helm repo update
 
 ```bash
 # Install with default values
-helm install my-api7ee ./helm/api7ee
+helm install my-api7ee ./helm/api7ee-demo-k8s-demo-k8s
 
 # Install in a specific namespace
-helm install my-api7ee ./helm/api7ee --namespace api7ee --create-namespace
+helm install my-api7ee ./helm/api7ee-demo-k8s-demo-k8s --namespace api7ee --create-namespace
 
 # Install with custom values file
-helm install my-api7ee ./helm/api7ee -f custom-values.yaml
+helm install my-api7ee ./helm/api7ee-demo-k8s-demo-k8s -f custom-values.yaml
 ```
 
 ## Configuration
@@ -131,10 +131,10 @@ api:
 
 ```bash
 # Upgrade to a new version
-helm upgrade my-api7ee ./helm/api7ee
+helm upgrade my-api7ee ./helm/api7ee-demo-k8s-demo-k8s
 
 # Upgrade with new values
-helm upgrade my-api7ee ./helm/api7ee --set web.replicaCount=3
+helm upgrade my-api7ee ./helm/api7ee-demo-k8s-demo-k8s --set web.replicaCount=3
 ```
 
 ## Uninstallation