Huawei Technologies Co. debuted its first in-house operating system for personal computers, offering an alternative to Microsoft Corp’s Windows as China pushes to replace American technologies amid rising geopolitical tensions.The company’s HarmonyOS is now ready to run on the MateBook Fold, its latest foldable laptop, consumer chief Richard Yu said Monday. Huawei is working to make its operating system compatible with more than 2,000 apps, including the popular WeChat and QQ messaging platforms...