feat: dynamic logo from synced assets + SVG favicon

Logo handler now checks Hub-synced assets first, falling back to
embedded SVG. Added SVG favicon to layout and catchall templates.

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

controller/internal/web/server.go

@@ -431,6 +431,16 @@ func (s *Server) serveChartJSHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) serveLogoHandler(w http.ResponseWriter, r *http.Request) {
+	// Try synced asset first (allows logo updates via Hub without rebuild)
+	if s.assetsSyncer != nil {
+		path := s.assetsSyncer.Resolve("felhom-logo.svg")
+		if _, err := os.Stat(path); err == nil {
+			w.Header().Set("Cache-Control", "public, max-age=86400")
+			http.ServeFile(w, r, path)
+			return
+		}
+	}
+	// Fallback to embedded logo
 	w.Header().Set("Content-Type", "image/svg+xml")
 	w.Header().Set("Cache-Control", "public, max-age=86400")
 	fmt.Fprint(w, FelhomLogoSVG)