Update VirtualMCP docs for groupRef changes

docs/toolhive/guides-vmcp/composite-tools.mdx

@@ -41,8 +41,8 @@ kind: VirtualMCPServer
 metadata:
   name: my-vmcp
 spec:
-  groupRef:
-    name: my-tools
+  config:
+    groupRef: my-tools
   # ... other configuration ...
   compositeTools:
     - name: my_workflow
@@ -325,8 +325,8 @@ metadata:
   name: workflow-vmcp
   namespace: toolhive-system
 spec:
-  groupRef:
-    name: my-tools
+  config:
+    groupRef: my-tools
   incomingAuth:
     type: anonymous
   aggregation:

docs/toolhive/guides-vmcp/configuration.mdx

@@ -42,8 +42,8 @@ metadata:
   name: my-vmcp
   namespace: toolhive-system
 spec:
-  groupRef:
-    name: my-group
+  config:
+    groupRef: my-group
   incomingAuth:
     type: anonymous # Disables authentication; do not use in production
 ```

docs/toolhive/guides-vmcp/tool-aggregation.mdx

@@ -208,8 +208,8 @@ metadata:
   name: demo-vmcp
   namespace: toolhive-system
 spec:
-  groupRef:
-    name: demo-tools
+  config:
+    groupRef: demo-tools
   incomingAuth:
     type: anonymous
   aggregation:

docs/toolhive/tutorials/quickstart-vmcp.mdx

@@ -123,8 +123,8 @@ metadata:
   namespace: toolhive-system
 spec:
   # Reference the MCPGroup containing fetch and osv servers
-  groupRef:
-    name: demo-tools
+  config:
+    groupRef: demo-tools
 
   # No incoming auth for development (anonymous access)
   incomingAuth:

static/api-specs/toolhive-crd-api.md

@@ -2067,7 +2067,7 @@ _Appears in:_
 | `podTemplateSpec` _[RawExtension](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#rawextension-runtime-pkg)_ | PodTemplateSpec defines the pod template to use for the Virtual MCP server<br />This allows for customizing the pod configuration beyond what is provided by the other fields.<br />Note that to modify the specific container the Virtual MCP server runs in, you must specify<br />the 'vmcp' container name in the PodTemplateSpec.<br />This field accepts a PodTemplateSpec object as JSON/YAML. |  | Type: object <br /> |
 | `telemetry` _[TelemetryConfig](#telemetryconfig)_ | Telemetry configures OpenTelemetry-based observability for the Virtual MCP server<br />including distributed tracing, OTLP metrics export, and Prometheus metrics endpoint |  |  |
 | `audit` _[AuditConfig](#auditconfig)_ | Audit configures audit logging for the Virtual MCP server<br />When enabled, audit logs include MCP protocol operations |  |  |
-| `config` _[Config](#config)_ | Config is the Virtual MCP server configuration<br />NOTE: THIS IS NOT CURRENTLY USED AND IS DUPLICATED FROM THE SPEC FIELDS ABOVE. |  |  |
+| `config` __object__ | Config is the Virtual MCP server configuration. <br /> <br /> The only field currently required within config is `config.groupRef`. GroupRef references an existing MCPGroup that defines backend workloads. The referenced MCPGroup must exist in the same namespace. <br /> <br /> NOTE: All other `config` fields will be ignored in favor of their inline versions above. |  |  |
 
 
 #### VirtualMCPServerStatus