v0.4.6: MariaDB validation fix + dashboard deployed-only + protected stack restart

- Fix ValidateDump() to scan first 10 lines for header (MariaDB 11.4+ sandbox comment)
- Dashboard shows only deployed/protected stacks, heading "Telepített alkalmazások"
- Protected stacks show restart button when operational (both dashboard + stacks page)
- API blocks all actions except restart on protected stacks
- docker-setup.sh creates .felhom.yml for FileBrowser (subdomain: files)

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

controller/internal/web/templates/stacks.html

@@ -59,6 +59,9 @@
         <div class="stack-detail-actions">
             {{if .Protected}}
                 <span class="badge badge-protected">Védett rendszerkomponens</span>
+                {{if isOperational .State}}
+                    <button class="btn btn-warning" onclick="stackAction('{{.Name}}', 'restart')">Újraindítás</button>
+                {{end}}
             {{else if not .Deployed}}
                 <a href="/stacks/{{.Name}}/deploy" class="btn btn-primary" onclick="return checkBeforeDeploy(event, '{{.Name}}')">Telepítés</a>
                 <a href="{{appPageURL .Meta.Slug}}" class="btn btn-outline">Részletek</a>