Fix ETCP session recovery and router lifecycle; confirm chat invites before publishing

src/utun_instance.h

@@ -210,6 +210,9 @@ struct UTUN_INSTANCE {
     struct chat_core_ctx* chat_core;      // chat_core.c (was g_cc)
     struct chat_sync*     chat_sync;      // chat_sync.c (was g_cs)
     struct join_key_entry* join_keys;     // chat_join.c (was g_keys; собственный init/destroy)
+    struct chat_join_registration* join_registrations;
+    int join_stopping;
+    struct chat_invite_build_req* invite_gui_request;
     struct dm_state*      dm;             // dm/dm_core.c (was g_dm)
     struct dm_mb_state*   dm_mailbox;     // dm/dm_mailbox.c (was g_mb)
     struct call_ctx*      call;           // call/call.c — P2P audio call