fix: node_registry crash — TOPO_NODE_REG_ENTRY node/lldata overlap

struct TOPO_NODE_REG_ENTRY имел node и ll.data[0] (гибкий массив) на одном смещении.
memcpy(re->ll.data, &node_id, 8) затирало re->node значением node_id,
из-за чего node_registry_find возвращал не указатель а битый node_id → SIGSEGV.

Убрал struct TOPO_NODE_REG_ENTRY, перешёл на явные смещения:
data[0..7]=ключ, data[8..15]=указатель, queue_entry_new(16).

src/routing_layer/topo_group.c

@@ -332,8 +332,9 @@ void topo_groups_destroy(struct UTUN_INSTANCE* instance) {
     if (g->node_registry) {
         struct ll_entry* re;
         while ((re = queue_data_get(g->node_registry)) != NULL) {
-            struct TOPO_NODE_REG_ENTRY* r = (struct TOPO_NODE_REG_ENTRY*)re;
-            topo_node_unref(r->node);
+            struct TOPO_NODE* node;
+            memcpy(&node, re->data + 8, sizeof(node));
+            topo_node_unref(node);
             queue_entry_free(re);
         }
         queue_free(g->node_registry);

src/routing_layer/topo_group.h

@@ -119,10 +119,9 @@ struct ETCP_LINK;
 
 #define TOPO_NODE_REGISTRY_HASH_SIZE 256
 
-struct TOPO_NODE_REG_ENTRY {
-    struct ll_entry ll;         // data[0..7] = node_id (hash key)
-    struct TOPO_NODE* node;
-};
+// node_registry entries: queue_entry_new(8 + sizeof(void*))
+//   data[0..7]  = node_id (hash key, index_size=8)
+//   data[8..15] = struct TOPO_NODE* pointer
 
 /**
  * @brief Группа топологии (одна на каждый group_id: utun, чат-группа, …)

src/routing_layer/topo_node.c

@@ -87,7 +87,10 @@ void topo_node_free_lists(struct TOPO_GROUP* group, struct TOPO_NODEQ* nq) {
 static struct TOPO_NODE* node_registry_find(struct TOPO_GROUPS* groups, uint64_t node_id) {
     if (!groups || !groups->node_registry) return NULL;
     struct ll_entry* e = queue_find_data_by_index(groups->node_registry, &node_id);
-    return e ? ((struct TOPO_NODE_REG_ENTRY*)e)->node : NULL;
+    if (!e) return NULL;
+    struct TOPO_NODE* node;
+    memcpy(&node, e->data + 8, sizeof(node));
+    return node;
 }
 
 struct TOPO_NODE* topo_node_registry_acquire(struct TOPO_GROUPS* groups, struct TOPO_NODE* ni) {
@@ -98,16 +101,15 @@ struct TOPO_NODE* topo_node_registry_acquire(struct TOPO_GROUPS* groups, struct
         topo_node_free_raw(groups, ni);
         return existing;
     }
-    struct ll_entry* qe = queue_entry_new(sizeof(struct TOPO_NODE_REG_ENTRY));
+    struct ll_entry* qe = queue_entry_new(8 + sizeof(struct TOPO_NODE*));
     if (!qe) {
         DEBUG_ERROR(DEBUG_CATEGORY_BGP, "registry_acquire: queue_entry_new failed for node=%016llx", (unsigned long long)ni->node_id);
         return NULL;
     }
-    struct TOPO_NODE_REG_ENTRY* re = (struct TOPO_NODE_REG_ENTRY*)qe;
-    re->node = ni;
     topo_node_ref(ni);
-    memcpy(re->ll.data, &ni->node_id, 8);
-    queue_data_put_with_index(groups->node_registry, &re->ll);
+    memcpy(qe->data,     &ni->node_id, 8);
+    memcpy(qe->data + 8, &ni,          sizeof(ni));
+    queue_data_put_with_index(groups->node_registry, qe);
     return ni;
 }