[Feature Request] jina-deepsearch-v1 integration

### 🥰 Feature Description

Hi NextChat team,
thanks for making the great product! we launched jina-deepsearch-v1, a new reasoning+search LLM API. [more info](https://github.com/jina-ai/node-DeepResearch)

We'd like to propose it as **a native built-in provider.** It's already working as a 3rd-party integration.

### 🧐 Proposed Solution

it's OpenAI compatible, native integration should be easy. [guidelines](https://github.com/jina-ai/node-DeepResearch?tab=readme-ov-file#client-integration-guidelines) :)

### 📝 Additional Information

_No response_