Adds the ability to list and download Gitea Actions artifacts. Extends the existing `actions_run_read` tool with four new methods rather than adding a separate tool, keeping artifacts alongside the runs/jobs/logs they belong to.
### New methods (`actions_run_read`)
| Method | Description | Key params |
| -------------------- | ------------------------------------------ | ------------------------------------------------------ |
| `list_artifacts` | List all artifacts in a repository | `owner`, `repo`, optional `artifact_name` filter |
| `list_run_artifacts` | List artifacts for one workflow run | `owner`, `repo`, `run_id` |
| `get_artifact` | Get metadata for a single artifact | `owner`, `repo`, `artifact_id` |
| `download_artifact` | Download an artifact's zip archive to disk | `owner`, `repo`, `artifact_id`, optional `output_path` |Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/210
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: bircni <bircni@icloud.com>
bircni