add sening functions

wangzhibo

2026-08-26 70481429367ca00144b24f118cbfdfb28b02967d

 xiaozhi-esp32-2.2.6/main/audio/wake_words/esp_wake_word.cc

@@ -48,6 +48,10 @@
    wake_word_detected_callback_ = callback;
}

void EspWakeWord::OnOfflineCommandDetected(std::function<void(const std::string& command)> callback) {
    offline_command_detected_callback_ = callback;
}

void EspWakeWord::Start() {
    running_ = true;
}