[Feature]: Hope to be able to add Gemini subscription login

### Issue Checklist

- [x] I understand that issues are for reporting problems and requesting features, not for off-topic comments, and I will provide as much detail as possible to help resolve the issue.
- [x] I have checked the pinned issues and searched through the existing [open issues](https://github.com/CherryHQ/cherry-studio/issues), [closed issues](https://github.com/CherryHQ/cherry-studio/issues?q=is%3Aissue%20state%3Aclosed), and [discussions](https://github.com/CherryHQ/cherry-studio/discussions) and did not find a similar suggestion.
- [x] I have provided a short and descriptive title so that developers can quickly understand the issue when browsing the issue list, rather than vague titles like "A suggestion" or "Stuck."
- [x] The latest version of Cherry Studio does not include the feature I am suggesting.

### Platform

Windows

### Version

v2.0.14

### Is your feature request related to an existing issue?

Hope to be able to add login to Gemini in the model service to use this model

### Desired Solution

null

### Alternative Solutions

_No response_

### Additional Information

_No response_

No files, tests, or entry points are named in the issue. Start by locating the model-service authentication flow and determine how Gemini subscription login should work; done means a Windows user can log in and use Gemini through the model service.

Written by the indexing model from the issue text.