fix(web): report unexpected HTTP serve failures (#6210)

* fix(web): report unexpected HTTP serve failures

* test(web): cover normal close and all HTTP servers

---------

Co-authored-by: n0ctal <293235942+n0ctal@users.noreply.github.com>

internal/web/network/serve.go

@@ -0,0 +1,17 @@
+package network
+
+import (
+	"errors"
+	"net"
+	"net/http"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/logger"
+)
+
+// ServeHTTP runs a panel HTTP server and records unexpected listener failures.
+// A normal Shutdown returns http.ErrServerClosed and is intentionally silent.
+func ServeHTTP(server *http.Server, listener net.Listener, name string) {
+	if err := server.Serve(listener); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		logger.Error(name, " stopped unexpectedly: ", err)
+	}
+}