feature: Gitea Integration

### Description of the issue

A integration for self hosted gitea would be great

### Your environment

* Version of Huly
* Browser (and version)
* Your operating system (and version)

### Steps to reproduce

Please produce the steps for us to reproduce this issue.

### Expected behaviour

Tell us what should happen.

### Actual behaviour

Tell us what happens instead (include screenshots or logs).

### Possible solutions

(Not obligatory)
If you know how to fix the bug, please describe your solution here.

The issue does not name any files, tests, or entry points. Start by finding existing source-control integrations in the TypeScript codebase and define the required self-hosted Gitea scope; done means the agreed Gitea integration works with a self-hosted instance.

Written by the indexing model from the issue text.