call: единый голосовой стек (libutun_voice) + SoundTouch на Android

- voice_jitter (кодированные Opus-кадры + decode-on-pull + SoundTouch time-stretch)
  вместо PCM-буфера audio_jitter; излишек держится до декодирования
- call_audio.c/.h — единая реализация для desktop/Android/headless (C-интерфейс)
- libutun_voice (voice_sources.cmake): SoundTouch + voice_jitter + call_audio + call_tones
- Android: pull-модель (nativeCallAudioPull), убран Kotlin FIFO, ANDROID_STL=c++_static
- headless audio-сокет: PCM-протокол (decode-only, без тактирования), daemon остаётся C-only
- CALL_STATS расширен dropped/underruns; удалены audio_jitter.cpp и libutun_lite/call_audio.c
- тест test_voice_jitter (ёмкость/догон/стационар), test_call_headless переведён на PCM

tools/chatgui-android/app/src/main/cpp/CMakeLists.txt

@@ -28,6 +28,20 @@ list(APPEND UTUN_INCLUDE_DIRS "${LIB_DIR}/libopus" "${LIB_DIR}/libopus/include"
 # Opus requires these to be defined (or HAVE_CONFIG_H + config.h with VAR_ARRAYS)
 list(APPEND UTUN_DEFINES OPUS_BUILD VAR_ARRAYS USE_ALLOCA)
 
+# Голосовой стек звонка (SoundTouch + voice_jitter + call_audio + call_tones),
+# C++ внутри, C-интерфейс наружу (call_audio.h).
+set(CALL_DIR ${SRC_DIR}/call)
+include(${CALL_DIR}/voice_sources.cmake)
+utun_setup_voice("${LIB_DIR}" "${CALL_DIR}")
+add_library(utun_voice STATIC ${UTUN_VOICE_SOURCES})
+target_include_directories(utun_voice PUBLIC ${UTUN_VOICE_INCLUDE_DIRS})
+set_source_files_properties(${CALL_DIR}/call_audio.c ${CALL_DIR}/call_tones.c PROPERTIES LANGUAGE C)
+set_target_properties(utun_voice PROPERTIES
+    C_STANDARD 99 C_STANDARD_REQUIRED ON
+    CXX_STANDARD 11 CXX_STANDARD_REQUIRED ON
+    POSITION_INDEPENDENT_CODE ON
+)
+
 # Prebuilt OpenSSL (cross-compiled for Android)
 set(OPENSSL_DIR ${CMAKE_CURRENT_SOURCE_DIR}/openssl/${ANDROID_ABI})
 add_library(openssl_crypto STATIC IMPORTED)
@@ -57,4 +71,4 @@ target_compile_definitions(utun PRIVATE ${UTUN_DEFINES} __ANDROID__)
 set_target_properties(utun PROPERTIES C_STANDARD 99 C_STANDARD_REQUIRED ON)
 
 find_library(log-lib log)
-target_link_libraries(utun ${log-lib} openssl_crypto)
+target_link_libraries(utun ${log-lib} openssl_crypto utun_voice)