feat(hub): Configuration page, asset seedOrUpdate, English UI

- Add Configuration page with "Refresh Assets" button
- Replace seedIfEmpty with seedOrUpdate (SHA-256 compare on startup)
- Translate all Hungarian text on Apps pages to English
- Add Configuration tab to all template navigation
- Expand isAssetFile to match favicon patterns
- Add felhom-logo.svg to website assets for the pipeline

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

hub/internal/web/templates/customer.html

@@ -13,7 +13,8 @@
             <nav class="nav-links" style="margin-bottom: 0.5rem;">
                 <a href="/" class="nav-link">Dashboard</a>
                 <a href="/configs" class="nav-link">Customers</a>
-                <a href="/apps" class="nav-link">Alkalmazások</a>
+                <a href="/apps" class="nav-link">Apps</a>
+                <a href="/configuration" class="nav-link">Configuration</a>
             </nav>
             <a href="/" class="back-link">&larr; Back to Dashboard</a>
             <h1>