fix: setup wizard logo not loading

The logo handler tried os.ReadFile() on a non-existent filesystem path.
The SVG only exists as an embedded string constant in the web package.
Export FelhomLogoSVG and serve it directly in the setup handler.

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

controller/internal/setup/handlers.go

@@ -21,6 +21,7 @@ import (
 	"gitea.dooplex.hu/admin/felhom-controller/internal/config"
 	"gitea.dooplex.hu/admin/felhom-controller/internal/report"
 	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/web"
 
 	"golang.org/x/crypto/bcrypt"
 )
@@ -291,15 +292,9 @@ func (s *Server) handleCSS(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) handleLogo(w http.ResponseWriter, r *http.Request) {
-	logoPath := filepath.Join(filepath.Dir(s.dataDir), "..", "internal", "web", "static", "felhom-logo.svg")
-	data, err := os.ReadFile(logoPath)
-	if err != nil {
-		http.NotFound(w, r)
-		return
-	}
 	w.Header().Set("Content-Type", "image/svg+xml")
 	w.Header().Set("Cache-Control", "public, max-age=86400")
-	w.Write(data)
+	fmt.Fprint(w, web.FelhomLogoSVG)
 }
 
 // --- Processing Logic ---