Establish Railiance Fabric graph model

examples/declarations/invalid/interface-bad-auth.yaml

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+apiVersion: railiance.fabric/v1alpha1
+kind: InterfaceDeclaration
+metadata:
+  id: railiance-platform.openbao.bad-auth
+  name: Bad auth interface
+  owner: railiance-platform
+  repo: railiance-platform
+  domain: railiance
+spec:
+  lifecycle: active
+  environments: [dev]
+  description: Invalid because oauth2 is not in the initial auth-method enum.
+  interface_type: http-api
+  version: v1
+  service_id: railiance-platform.openbao
+  auth:
+    method: oauth2
+  data_classification: internal