call: P2P аудиозвонки — сигналинг, релей медиа, аудио-контур, headless/desktop/android

- src/call/: сигналинг (call.c, call_proto.h, ETCP_RT_ID_CALL 0x36) + релей медиа
  + headless аудио-сокет (call_headless.c, call_audio_bind) + Opus/jitter/тоны
- chat: события CHAT_EVT_CALL_* (34–40), CHAT_EVT_DM_MESSAGES (41), DM-трамплины
- chatgui: call window, miniaudio I/O, audio_frame_ring, test_audio_jitter
- chatgui-android: CallScreen/IncomingCallDialog, аудио-роутинг, JNI, рингтон
- tests: test_call, test_call_headless

tools/chatgui/src/accountlist.cpp

@@ -471,6 +471,10 @@ void AccountList::onMemberContextMenu(const QPoint& pos) {
     QString name = m_model->data(index, Qt::DisplayRole).toString();
 
     QMenu menu(m_listView);
+    QAction* pmAction = menu.addAction(QString::fromUtf8("Написать сообщение"));
+    if (nodeId == m_db->myNodeId()) pmAction->setEnabled(false);
+    QAction* callAction = menu.addAction(QString::fromUtf8("Позвонить"));
+    if (nodeId == m_db->myNodeId() || !m_model->isOnlineAt(index.row())) callAction->setEnabled(false);
     QAction* connectAction = menu.addAction("Connect");
     if (nodeId == m_db->myNodeId()) connectAction->setEnabled(false);
     QAction* renameAction = menu.addAction("Rename");
@@ -478,6 +482,16 @@ void AccountList::onMemberContextMenu(const QPoint& pos) {
     QAction* editAction = menu.addAction("Edit");
     QAction* chosen = menu.exec(m_listView->viewport()->mapToGlobal(pos));
 
+    if (chosen == pmAction) {
+        emit pmRequested(m_channelId, nodeId, name);
+        return;
+    }
+
+    if (chosen == callAction) {
+        emit callRequested(m_channelId, nodeId, name);
+        return;
+    }
+
     if (chosen == connectAction) {
         struct chat_connect_node_req* r = (struct chat_connect_node_req*)u_malloc(sizeof(*r));
         if (!r) return;