etcp: add link addresses to all UP/DOWN/close log messages

- etcp_on_up: list up-link addresses after connection summary
- etcp_on_down: show all link addresses that were lost
- Link UP (server/client): add addr=X
- Connection established: add addr=X
- Link closed: add addr=X before traffic stats
- Link down (keepalive timeout): add addr=X
Now: [conn] Link 1 UP (server, mtu=1600, addr=192.168.40.247:2122)

src/routing_layer/topo_node_sqlite.c

@@ -747,6 +747,29 @@ int topo_node_sqlite_get_public_peers(sqlite3* db, const char* channel_id,
     return 0;
 }
 
+int topo_node_sqlite_get_supernode_peers(sqlite3* db, const char* channel_id,
+                                          uint64_t** out_ids, int* out_count) {
+    if (!db || !channel_id || !out_ids || !out_count) return -1;
+    *out_ids = NULL; *out_count = 0;
+    char peers_tbl[80]; peers_table_name(channel_id, peers_tbl, sizeof(peers_tbl));
+    char sql[256]; snprintf(sql, sizeof(sql),
+        "SELECT p.node_id FROM \"%s\" p WHERE p.node_type=4"
+        " AND EXISTS (SELECT 1 FROM node_addresses na WHERE na.node_id=p.node_id AND na.family=4)",
+        peers_tbl);
+    sqlite3_stmt* st = NULL;
+    if (sqlite3_prepare_v2(db, sql, -1, &st, NULL) != SQLITE_OK) return -1;
+    int cnt = 0;
+    while (sqlite3_step(st) == SQLITE_ROW) cnt++;
+    if (cnt == 0) { sqlite3_finalize(st); return 0; }
+    uint64_t* ids = u_malloc((size_t)cnt * sizeof(uint64_t));
+    if (!ids) { sqlite3_finalize(st); return -1; }
+    sqlite3_reset(st); int i = 0;
+    while (sqlite3_step(st) == SQLITE_ROW) ids[i++] = (uint64_t)sqlite3_column_int64(st, 0);
+    sqlite3_finalize(st);
+    *out_ids = ids; *out_count = cnt;
+    return 0;
+}
+
 int topo_node_sqlite_get_local_peers(sqlite3* db, const char* channel_id,
                                       uint64_t** out_ids, int* out_count, uint64_t self_node_id) {
     if (!db || !out_ids || !out_count) return -1;