Fix Grafana datasource URLs for docker driver

After minikube migration from podman to docker driver, the hostname
host.containers.internal no longer resolves. Use host.minikube.internal
which is the correct hostname for docker driver.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

argocd/manifests/grafana/values.yaml

@@ -24,8 +24,8 @@ grafana.ini:
     check_for_updates: false
     reporting_enabled: false
 
-# Datasources - point to indri services via podman host gateway
-# host.containers.internal resolves to the podman host (indri) from inside minikube
+# Datasources - point to indri services via docker host gateway
+# host.minikube.internal resolves to the docker host (indri) from inside minikube
 datasources:
   datasources.yaml:
     apiVersion: 1
@@ -35,7 +35,7 @@ datasources:
         access: proxy
         orgId: 1
         uid: prometheus
-        url: http://host.containers.internal:9090
+        url: http://host.minikube.internal:9090
         isDefault: true
         editable: false
       - name: Loki
@@ -43,7 +43,7 @@ datasources:
         access: proxy
         orgId: 1
         uid: loki
-        url: http://host.containers.internal:3100
+        url: http://host.minikube.internal:3100
         editable: false
 
 # Dashboard provisioning - sidecar watches for ConfigMaps with label