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Hernandez Avelino 09d0a17453 fix(api): handle array message content on OpenAI chat completions (#15359 )

### Related issues

Closes #15358

<!-- After filing upstream, replace XXXX with your issue number. -->

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### What problem does this PR solve?

`POST /api/v1/openai/<chat_id>/chat/completions` forwards `messages` to
`async_chat` without normalizing `content`. Downstream, `dialog_service`
assumes string content:

```python
re.sub(r"##\d+\$\$", "", m["content"])
```

OpenAI-compatible clients may send `content` as an **array** of parts
(text, `image_url`, etc.), including text-only arrays. That causes
`TypeError` and HTTP **500** instead of a valid response or a clear
**400**.

`openai_api.py` also reads `messages[-1]["content"]` directly for
`prompt` without handling list-shaped content.

This PR normalizes array `content` to a string (concatenating `type:
text` parts) before calling `async_chat`, matching a minimal
OpenAI-compat path. Image parts can be documented as unsupported or
handled in a follow-up if vision integration is required.

2026-06-02 10:27:03 +08:00