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/server.go

@@ -17,6 +17,7 @@ import (
 	"sync"
 	"time"
 
+	"gitea.dooplex.hu/admin/felhom-hub/internal/assets"
 	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
 	"golang.org/x/crypto/bcrypt"
 )
@@ -38,6 +39,7 @@ type Server struct {
 	staleThreshold  time.Duration
 	versionChecker  *VersionChecker
 	templateFetcher *TemplateFetcher
+	assetsMgr       *assets.Manager
 
 	sessions   map[string]*hubSession
 	sessionsMu sync.RWMutex
@@ -113,6 +115,11 @@ func (s *Server) SetTemplateFetcher(tf *TemplateFetcher) {
 	s.templateFetcher = tf
 }
 
+// SetAssetManager sets the asset manager for the Configuration page (optional).
+func (s *Server) SetAssetManager(am *assets.Manager) {
+	s.assetsMgr = am
+}
+
 // ServeHTTP routes web requests.
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	path := r.URL.Path
@@ -138,6 +145,12 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/javascript")
 		w.Header().Set("Cache-Control", "public, max-age=86400")
 		w.Write(chartJS)
+	case path == "/configuration":
+		if r.Method == http.MethodPost {
+			s.handleConfigurationAction(w, r)
+		} else {
+			s.handleConfiguration(w, r)
+		}
 	case path == "/apps" || path == "/apps/":
 		s.handleApps(w, r)
 	case strings.HasPrefix(path, "/apps/") && strings.HasSuffix(path, "/reset-telemetry"):
@@ -606,3 +619,48 @@ func statusColor(status string) string {
 func statusIcon(status string) string {
 	return "●"
 }
+
+// handleConfiguration renders the Configuration page.
+func (s *Server) handleConfiguration(w http.ResponseWriter, r *http.Request) {
+	csrfToken := s.getCSRFToken(r)
+
+	assetCount := 0
+	assetLastSync := ""
+	if s.assetsMgr != nil {
+		assetCount = s.assetsMgr.FileCount()
+		if m := s.assetsMgr.GetManifest(); m != nil {
+			assetLastSync = m.Generated
+		}
+	}
+
+	data := map[string]interface{}{
+		"CSRFToken":     csrfToken,
+		"AssetCount":    assetCount,
+		"AssetLastSync": assetLastSync,
+		"Flash":         r.URL.Query().Get("flash"),
+	}
+	if err := s.templates.ExecuteTemplate(w, "configuration.html", data); err != nil {
+		s.logger.Printf("[ERROR] configuration.html template: %v", err)
+	}
+}
+
+// handleConfigurationAction handles POST actions on the Configuration page.
+func (s *Server) handleConfigurationAction(w http.ResponseWriter, r *http.Request) {
+	action := r.FormValue("action")
+	switch action {
+	case "refresh_assets":
+		if s.assetsMgr == nil {
+			http.Redirect(w, r, "/configuration?flash=assets_not_configured", http.StatusSeeOther)
+			return
+		}
+		if err := s.assetsMgr.ReSeed(); err != nil {
+			s.logger.Printf("[ERROR] Asset re-seed failed: %v", err)
+			http.Redirect(w, r, "/configuration?flash=assets_error", http.StatusSeeOther)
+			return
+		}
+		s.logger.Printf("[INFO] Manual asset re-seed completed")
+		http.Redirect(w, r, "/configuration?flash=assets_refreshed", http.StatusSeeOther)
+	default:
+		http.Redirect(w, r, "/configuration", http.StatusSeeOther)
+	}
+}