Function select_repository 

pub async fn select_repository(
    client: &PlatformApiClient,
    project_id: &str,
    project_path: &Path,
) -> RepositorySelectionResult

Select repository for deployment

Smart repository selection with connection flow:

1. Check for GitHub App installations
2. Fetch connected and available repositories
3. Detect local git remote and match against repos
4. Offer to connect if local repo available but not connected
5. Fall back to manual selection from available repos