llm.toolHook break for openAI on HTTP response

[xquanluu]

https://github.com/jambonz/jambonz-feature-server/pull/1167/changes

openai llm verb is not working for toolhook

http server return body for call hook:
{
"type": "conversation.item.create",
"item": {
"type": "function_call_output",
"call_id": "call_8bDvLnS28U4ptZQC",
"output": "null"
}
}

but feature server keep say:

{"level":20,"time":1777967577921,"pid":1232,"hostname":"ip-10-1-65-45","callId":"3af184d9-c2fa-123f-49bb-069476782b55","callSid":"1b5909ab-62d8-4094-9390-1a685a42d9c5","accountSid":"f1a5a42c-ab6d-44d0-8d03-de9b410f5eb9","callingNumber":"test1","calledNumber":"12","traceId":"bfb7c1a904a7e3c28126487445c78d80","tool_call_id":"call_8bDvLnS28U4ptZQC","data":{"type":"client_tool_result","item":{"type":"function_call_output","call_id":"call_8bDvLnS28U4ptZQC","output":"null"},"invocation_id":"call_8bDvLnS28U4ptZQC"},"msg":"TaskLlmOpenAI_S2S:processToolOutput"}
{"level":30,"time":1777967577921,"pid":1232,"hostname":"ip-10-1-65-45","callId":"3af184d9-c2fa-123f-49bb-069476782b55","callSid":"1b5909ab-62d8-4094-9390-1a685a42d9c5","accountSid":"f1a5a42c-ab6d-44d0-8d03-de9b410f5eb9","callingNumber":"test1","calledNumber":"12","traceId":"bfb7c1a904a7e3c28126487445c78d80","data":{"type":"client_tool_result","item":{"type":"function_call_output","call_id":"call_8bDvLnS28U4ptZQC","output":"null"},"invocation_id":"call_8bDvLnS28U4ptZQC"},"msg":"TaskLlmOpenAI_S2S:processToolOutput - invalid tool output, must be conversation.item.create"}

[xquanluu]

The bug is that
the PR https://github.com/jambonz/jambonz-feature-server/pull/1167/changes was tested with wrong HTTP toolHook response body and PR was trying to modify the response unexpected to make it work with Elevenlabs/Ultravox but break completely for open AI