feat: Add responses and safety impl with extra body

docs/static/llama-stack-spec.yaml

@@ -4416,6 +4416,20 @@ components:
           url_citation: '#/components/schemas/OpenAIResponseAnnotationCitation'
           container_file_citation: '#/components/schemas/OpenAIResponseAnnotationContainerFileCitation'
           file_path: '#/components/schemas/OpenAIResponseAnnotationFilePath'
+    OpenAIResponseContentPartRefusal:
+      type: object
+      properties:
+        type:
+          type: string
+          const: refusal
+          default: refusal
+        refusal:
+          type: string
+      additionalProperties: false
+      required:
+        - type
+        - refusal
+      title: OpenAIResponseContentPartRefusal
     OpenAIResponseInputMessageContent:
       oneOf:
         - $ref: '#/components/schemas/OpenAIResponseInputMessageContentText'
@@ -4515,6 +4529,15 @@ components:
         under one type because the Responses API gives them all the same "type" value,
         and there is no way to tell them apart in certain scenarios.
     OpenAIResponseOutputMessageContent:
+      oneOf:
+        - $ref: '#/components/schemas/OpenAIResponseOutputMessageContentOutputText'
+        - $ref: '#/components/schemas/OpenAIResponseContentPartRefusal'
+      discriminator:
+        propertyName: type
+        mapping:
+          output_text: '#/components/schemas/OpenAIResponseOutputMessageContentOutputText'
+          refusal: '#/components/schemas/OpenAIResponseContentPartRefusal'
+    "OpenAIResponseOutputMessageContentOutputText":
       type: object
       properties:
         text: