conn_mgr: move etcp_router bind/unbind from per-group to instance level

svc_id=17 (ETCP_RT_ID_CONN_MGR) is a singleton resource — bind once
at utun_instance_init, unbind once at utun_instance_destroy.
Previously each conn_mgr (one per group) called bind/unbind separately,
causing 'overwriting' and 'not bound' WARNs on every group init/shutdown.
Handler dispatches by group_id from message — no need for per-group binding.

src/routing_layer/conn_mgr.h

@@ -76,6 +76,7 @@ typedef void (*conn_mgr_cb_t)(struct CONN_MGR_HANDLE* h,
 
 struct CONN_MGR* conn_mgr_init(struct TOPO_GROUP* group);
 void conn_mgr_destroy(struct CONN_MGR* mgr);
+void conn_mgr_router_recv_handler(struct ETCP_CONN* conn, struct ll_entry* entry);
 
 /* ═══════ единая точка входа ═══════ */
 

src/routing_layer/conn_mgr_core.c

@@ -342,9 +342,6 @@ struct CONN_MGR* conn_mgr_init(struct TOPO_GROUP* group) {
     mgr->bg_ping_timer = uasync_set_timeout(mgr->instance->ua, CONN_MGR_BG_PING_INTERVAL_TB, mgr, cm_bg_ping_timer_cb, "conn_mgr_bg_ping");
     mgr->candidate_ping_timer = uasync_set_timeout(mgr->instance->ua, CONN_MGR_CANDIDATE_PING_TB, mgr, cm_candidate_ping_timer_cb, "conn_mgr_cand_ping");
     mgr->bg_ping_cycle_start_tb = get_time_tb(); mgr->initialized = 1;
-    /* Первый conn_mgr биндит etcp_router (остальные перезаписывают тот же коллбэк — безвредно) */
-    etcp_router_bind(mgr->instance, ETCP_RT_ID_CONN_MGR, conn_mgr_router_recv_handler);
-    etcp_bind(mgr->instance, ETCP_RT_ID_CONN_MGR, conn_mgr_router_recv_handler);
     DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "conn_mgr: initialized for group %016llx", (unsigned long long)group->group_id);
     return mgr;
 }
@@ -353,9 +350,6 @@ void conn_mgr_destroy(struct CONN_MGR* mgr) {
     if (!mgr) return;
     if (mgr->bg_ping_timer) { uasync_cancel_timeout(mgr->instance->ua, mgr->bg_ping_timer); mgr->bg_ping_timer = NULL; }
     if (mgr->candidate_ping_timer) { uasync_cancel_timeout(mgr->instance->ua, mgr->candidate_ping_timer); mgr->candidate_ping_timer = NULL; }
-    /* Отвязываемся от etcp_router (если ещё не отвязаны) */
-    etcp_router_unbind(mgr->instance, ETCP_RT_ID_CONN_MGR);
-    etcp_unbind(mgr->instance, ETCP_RT_ID_CONN_MGR);
     {   size_t ec = queue_entry_count(mgr->entries);
         struct ll_entry* e = mgr->entries->head;
         while (e) { struct ll_entry* next = e->next; struct CONN_MGR_ENTRY* entry = (struct CONN_MGR_ENTRY*)e; cm_entry_cleanup(entry); e = next; }

src/utun_instance.c

@@ -206,6 +206,8 @@ static int instance_init_common(struct UTUN_INSTANCE* instance, struct UASYNC* u
             DEBUG_ERROR(DEBUG_CATEGORY_BGP, "Failed to initialize BGP module");
         } else {
             DEBUG_INFO(DEBUG_CATEGORY_BGP, "BGP module initialized");
+            etcp_router_bind(instance, ETCP_RT_ID_CONN_MGR, conn_mgr_router_recv_handler);
+            etcp_bind(instance, ETCP_RT_ID_CONN_MGR, conn_mgr_router_recv_handler);
             struct TOPO_GROUP* g = topo_groups_get_default(instance->topo_groups);
             if (instance->rt && g && g->local_node) {
                 topo_group_update_my_nodeinfo(instance, g);
@@ -436,6 +438,8 @@ void utun_instance_destroy(struct UTUN_INSTANCE *instance) {
     // Cleanup BGP module BEFORE sockets (needs live conn_mgr for recovery cleanup)
     if (instance->topo_groups) {
         DEBUG_INFO(DEBUG_CATEGORY_BGP, "Destroying BGP module");
+        etcp_router_unbind(instance, ETCP_RT_ID_CONN_MGR);
+        etcp_unbind(instance, ETCP_RT_ID_CONN_MGR);
         topo_groups_destroy(instance);
     }