feat: add config replication fields to myconf_t, cluster_t, ha_state_t, persist_t; create byteorder.h

src/include/xce/cluster_def.h

@@ -120,6 +120,10 @@ typedef struct cluster_s {
     int                 running;
     persist_t           persist;   /* Persistence module — P0-F */
     ha_state_t          ha;        /* HA role management — P1-5 */
+    _Atomic int         restart_requested;           /* set by OP_upgradeConfig handler */
+    pthread_t           heartbeat_listener_tid;      /* pre-Phase-2 SSL listener thread */
+    _Atomic int         heartbeat_listener_running;
+    _Atomic int         lost_and_found_job_count;    /* incremented during persist_recover() */
 } cluster_t;
 
 #endif /* XCE_CLUSTER_DEF_H */