feat: 长保持连接，控制端可重启

python/omnisocket/_omnisocket.c

@@ -67,7 +67,7 @@ static PyObject *build_recv_meta_dict(
 
 static PyObject *build_stats_dict(const omnisocket_session_stats_t *stats) {
     return Py_BuildValue(
-        "{s:K,s:K,s:K,s:K,s:K,s:K,s:K,s:i}",
+        "{s:K,s:K,s:K,s:K,s:K,s:K,s:K,s:i,s:i,s:s}",
         "send_calls",
         (unsigned long long) stats->send_calls,
         "send_bytes",
@@ -83,7 +83,11 @@ static PyObject *build_stats_dict(const omnisocket_session_stats_t *stats) {
         "recv_errors",
         (unsigned long long) stats->recv_errors,
         "connected",
-        stats->connected
+        stats->connected,
+        "registered",
+        stats->registered,
+        "last_server_error",
+        stats->last_server_error
     );
 }