Show subdomain URL on protected stack cards (e.g. FileBrowser)

Protected stacks like FileBrowser have no app.yaml so Deployed=false,
which caused the URL link condition to fail. Now also shows the URL
when the stack is protected.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/web/templates/stacks.html

@@ -25,7 +25,7 @@
                 <div>
                     <h3>{{.Meta.DisplayName}}</h3>
                     {{$subdomain := index $.Subdomains .Name}}
-                    {{if and $subdomain .Deployed}}
+                    {{if and $subdomain (or .Deployed .Protected)}}
                     <a class="subdomain-link" href="https://{{$subdomain}}.{{$.Domain}}" target="_blank">
                         {{$subdomain}}.{{$.Domain}} ↗
                     </a>