Add job_id and prompt_id to AssetUpdated schema

Mirrors the Asset schema's deprecation pattern: prompt_id is marked
deprecated with a description pointing to job_id; job_id is the new
preferred field. PUT /api/assets/{id} responses can now carry both fields
consistent with the other Asset-returning endpoints.

openapi.yaml

@@ -6457,6 +6457,17 @@ components:
         user_metadata:
           type: object
           additionalProperties: true
+        prompt_id:
+          type: string
+          format: uuid
+          nullable: true
+          deprecated: true
+          description: "Deprecated: use job_id instead. ID of the prompt that created this asset."
+        job_id:
+          type: string
+          format: uuid
+          nullable: true
+          description: ID of the job that created this asset
         updated_at:
           type: string
           format: date-time