fix: replace invalid incomingAuth.oidc with MCPOIDCConfig + oidcConfigRef

The .spec.incomingAuth.oidc inline block is not a valid field in the
v0.29.3 VirtualMCPServer CRD schema, causing ArgoCD ComparisonErrors.

The correct v0.29.3 API separates OIDC provider config into a dedicated
MCPOIDCConfig (v1beta1) resource, referenced from the VirtualMCPServer
via spec.incomingAuth.oidcConfigRef.name.

- Add MCPOIDCConfig resources for state-docs-vmcp and full-vmcp (inline
  type, Keycloak issuer, replicated client secrets from keycloak ns)
- Update state-docs-vmcp and full-vmcp VirtualMCPServer manifests to
  reference the new MCPOIDCConfig resources via oidcConfigRef
- Register new MCPOIDCConfig files in vmcp-servers kustomization

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

manifest/overlays/production/vmcp-servers/oidcconfig-full-vmcp.yaml

@@ -0,0 +1,13 @@
+apiVersion: toolhive.stacklok.dev/v1beta1
+kind: MCPOIDCConfig
+metadata:
+  name: full-vmcp-oidc
+  namespace: toolhive-system
+spec:
+  type: inline
+  inline:
+    issuer: https://cloak.olb42.com/realms/home-lab
+    clientId: toolhive-full-vmcp
+    clientSecretRef:
+      name: toolhive-full-vmcp-secret
+      key: client-secret