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/cmd/hub/main.go

@@ -143,6 +143,7 @@ func main() {
 
 	webServer := web.New(dataStore, cfg.Auth.PasswordHash, cfg.API.ReportAPIKey, Version, staleThreshold, logger)
 	webServer.SetTemplateFetcher(templateFetcher)
+	webServer.SetAssetManager(assetsMgr)
 
 	// Build HTTP mux
 	mux := http.NewServeMux()