You have a budget phone. There's no parts on the market for that. You'll have to buy another similar module and extract that part in order to fix it. Expect to pay about $40-80 for the repair if you bring it to a repair shop.
no there is no hdd in there. for a time capsule the hard drive might die after a long period of time. if you want to preserve data for long periods of time you best bet is to copy your data into an SD card and vacuum seal it so nothing gets in.
Its your touchscreen you need to replace. I suggest bringing it back to the store for a return as its a defective unit. There's nothing you can do to fix it. If you do intend to bring it to a repair shop. expect to pay $100-$150 for the repair.
You best best is to replace the keyboard, but most likely no one sells parts for this. You can just buy another same model and bring it to a repair shop to have them swap out the keyboard for you. Expect to pay about $40-80 for it.
i highly doubt any repair shops repair this model. if you value your data and can't get it back your best option is to buy another nook and swap out the motherboards between them. i doubt there would be any parts on the market for that device due to it not being popular.
currently there is no Huawei office you can send to. your best option would be to contact your local repair shop and ask them to resolder a volume for you. Cost should be around $40-$80. If that's too much for you, just get another phone as no repair shop would do it for any less.