I honestly don't really understand what 15K in precious metals would really do for anyone. It would have to be such a specific situation where it would be of any use, and then, it would have to be a very temporary situation, because 15K isn't very much.
I honestly can't think of a single, plausible scenario that's even remotely likely to happen where 15K of precious metals makes a significant difference in your long term future outcomes. 15K worth of non perishable astronaut food? Sure. 15K worth of guns and ammo? Why not? 15K worth of education in life saving skills and supplies? Sounds like a great idea! Man, it's actually a fun game coming up with ways in which 15K could serve you in a doomsday scenario. 15K worth of metal falls pretty low on my list of things I would spend on to prep for global chaos.
As for housing, buy a house if/when it makes sense for you. The less house you buy, the less you need to stress about what the housing market does, so focus on seeing what kind of housing you can comfortably afford and not have to stress over. If affordable housing can't be found in your market, then think carefully about your housing plans moving forward.
Hyperinflation?
I don't really know how one can hedge against this. You will simply have to decide if you are comfortable banking on your country's economy or not. That's really what it comes down to, because how do you even plan if you think your country might go the way of Venezuela?
Personally, my thinking is that it's more important to factor in hedges against the personal risks as opposed to the global economic risks, which you really don't have many levers to hedge against. The personal risks are over leveraging yourself, divorce, job security, and having limited professional options.
Really, IMO, that last one is a very large risk factor that many people fail to hedge against. That's probably my opinion because I recently lost my ability to work in my own profession, and have been saved by my multitude of alternate professional skills. In the face of a volatile situation, the ability to pivot, change industries, change locations, change type of work, those are the most powerful hedging levers you can have when the professional world is unstable.
Personally, I would think 15K in Mandarin classes is probably a better hedge than 15K of precious metals if we're looking at more realistic scenarios of the US economy falling apart.