fix(ui): set IsRepoAdmin context data for Licenses tab visibility

The template couldn't call .Permission.IsAdmin() directly. Set
IsRepoAdmin as a context data variable so the template can use it.
Licenses tab now shows for repo admins even without packages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/context/repo.go

@@ -612,6 +612,7 @@ func repoAssignmentPrepareTemplateData(ctx *Context, data *repoAssignmentPrepare
 	})
 	ctx.Data["NumLicensePackages"] = numLicensePackages
 	ctx.Data["EnableLicenses"] = numLicensePackages > 0
+	ctx.Data["IsRepoAdmin"] = ctx.Repo.Permission.IsAdmin()
 
 	ctx.Data["Title"] = repo.Owner.Name + "/" + repo.Name
 	ctx.Data["PageTitleCommon"] = repo.Name + " - " + setting.AppName

templates/repo/header.tmpl

@@ -128,7 +128,7 @@
 						</a>
 					{{end}}
 
-					{{if or .EnableLicenses (.Permission.IsAdmin)}}
+					{{if or .EnableLicenses .IsRepoAdmin}}
 						<a href="{{.RepoLink}}/licenses" class="{{if .IsLicensesPage}}active {{end}}item">
 							{{svg "octicon-key"}} {{ctx.Locale.Tr "repo.licenses"}}
 							{{if .NumLicensePackages}}