feat(audio): musica acelerada en CONTINUE?, game_over.ogg, tick del countdown

source/core/audio/audio.cpp

@@ -113,6 +113,13 @@ void Audio::stopMusic() {
     }
 }
 
+// NOLINTNEXTLINE(readability-make-member-function-const)
+void Audio::setMusicSpeed(float ratio) {
+    if (music_enabled_) {
+        engine_->setMusicSpeed(ratio);
+    }
+}
+
 // Reprodueix un so per nom
 // NOLINTNEXTLINE(readability-make-member-function-const) — muta estat via engine_; unique_ptr::operator-> no propaga const
 void Audio::playSound(const std::string& name, Group group) {