v0.4.7: Protected stack detail pages + backup page caching

Task 1: Protected stacks with .felhom.yml (slug) are now clickable
on both dashboard and stacks pages. "Részletek" button added to
protected stack actions section. Filebrowser .felhom.yml updated
with resources metadata.

Task 2: Backup page now reads from a cached FullBackupStatus that
refreshes every 5 minutes in background + after each backup run.
Page loads instantly instead of blocking on restic/docker subprocesses.

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

controller/internal/web/templates/stacks.html

@@ -17,7 +17,7 @@
 
 <div class="stack-grid">
     {{range .Stacks}}
-    <div class="stack-detail-card stack-state-{{stateColor .State}}" data-filter-state="{{filterCategory .State .Deployed}}"{{if not .Protected}} data-href="/apps/{{.Meta.Slug}}"{{end}}>
+    <div class="stack-detail-card stack-state-{{stateColor .State}}" data-filter-state="{{filterCategory .State .Deployed}}"{{if .Meta.Slug}} data-href="/apps/{{.Meta.Slug}}"{{end}}>
         <div class="stack-detail-header">
             <div class="stack-title-row">
                 <img class="stack-logo-lg" src="{{logoURL .Meta.Slug}}"
@@ -62,6 +62,9 @@
                 {{if isOperational .State}}
                     <button class="btn btn-warning" onclick="stackAction('{{.Name}}', 'restart')">Újraindítás</button>
                 {{end}}
+                {{if .Meta.Slug}}
+                    <a href="/apps/{{.Meta.Slug}}" class="btn btn-outline">Részletek</a>
+                {{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>