✨ Add grafana provider to defaults and README (#7094)

Register the grafana provider in DefaultProviders so it is discoverable
in air-gapped environments, and add it to the README connection table.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tas50

README.md

@@ -122,6 +122,7 @@ To learn about Mondoo Platform, read the [Mondoo Platform docs](https://mondoo.c
 | GitLab groups                 | `gitlab`                   | `mql shell gitlab --group mondoohq`                                                                                                             |
 | Google Cloud projects         | `gcp`                      | `mql shell gcp`                                                                                                                                 |
 | Google Workspace              | `google-workspace`         | `mql shell google-workspace --customer-id CUSTOMER_ID --impersonated-user-email EMAIL --credentials-path JSON_FILE`                             |
+| Grafana organizations         | `grafana`                  | `mql shell grafana --url https://myorg.grafana.net --token TOKEN`                                                                               |
 | OPC UA IoT devices            | `opcua`                    | `mql shell opcua`                                                                                                                               |
 | IP address information        | `ipinfo`                   | `mql shell ipinfo`                                                                                                                              |
 | IPMI-enabled devices          | `ipmi`                     | `mql shell ipmi user@HOST`                                                                                                                      |

providers/defaults.go

@@ -200,6 +200,21 @@ var DefaultProviders Providers = map[string]*Provider{
 		},
 	},
 
+	"grafana": {
+		Provider: &plugin.Provider{
+			Name:            "grafana",
+			ID:              "go.mondoo.com/mql/v13/providers/grafana",
+			ConnectionTypes: []string{"grafana"},
+			Connectors: []plugin.Connector{
+				{
+					Name:  "grafana",
+					Use:   "grafana",
+					Short: "a Grafana organization",
+				},
+			},
+		},
+	},
+
 	"github": {
 		Provider: &plugin.Provider{
 			Name:            "github",