fix: auto_socket TCP hang + missing debug config apply in utun_instance_create_from_config

auto_socket.c: remove tsrv from inst->stcp_servers before stcp_link_server_destroy
when TCP socket has null addr — freed pointer stayed in linked list corrupting it
on next stcp_server_listen->stcp_server_list_add, causing hang

utun_instance.c: apply debug_level + per-category debug from config in
utun_instance_create_from_config (was only in utun_instance_create)

chat_core.c: verbose error log on invalid args

src/chat/chat_core.c

@@ -88,7 +88,7 @@ void si_register(struct DB_SYNC_INSTANCE* si, const char* ch_id) {
 /* ─── жизненный цикл ─── */
 
 int chat_core_init(struct UTUN_INSTANCE* inst, const char* db_path) {
-    if (!inst || !db_path) return -1;
+    if (!inst || !db_path) { DEBUG_ERROR(DEBUG_CATEGORY_CHAT_SYNC, "%s: invalid args inst=%p db_path=%p", CC_ID, (void*)inst, (void*)db_path); return -1; }
     memset(&g_cc, 0, sizeof(g_cc));
     snprintf(g_cc.db_path, sizeof(g_cc.db_path), "%s", db_path);