fix: roundTo returns null for a null value instead of throwing

[marc0olo]

Live 500 on the NFT detail page. https://soon.market/nft/4398046952294 and .../4398046704949 both show "Something went wrong":

java.lang.NullPointerException
  at com.kryptokrauts.shared.BaseMapper.roundTo(BaseMapper.java:124)
  at com.kryptokrauts.shared.BaseMapper.roundTo(BaseMapper.java:128)
  at com.kryptokrauts.soonmarket.service.NFTService.getNFTDetail(NFTService.java:662)

Cause

roundTo unboxes its argument:

return Math.round(value * Math.pow(10, decimals)) / Double.valueOf(Math.pow(10, decimals));

That was harmless while every usd value was a number. #7 made them null when the token has no exchange rate, and every caller that hands a usd value straight to roundTo began throwing instead of rendering nothing.

NFTService:662 is one:

.priceUSD(BaseMapper.roundTo(floorListing.getListingPriceUsd()))

So the detail page 500s for any NFT whose template has a floor listing priced in FOOBAR, RDM or EASY. That is why it looks scattered rather than affecting a whole category — it depends on the template's floor listing, not on the NFT itself.

Fix

Rounding an unknown value yields an unknown value. The guard belongs in roundTo, not at each caller: there are 22 callers across 8 files in soon-market-api alone, plus more in the other consumers, and every one of them wants the same answer.

What went wrong in #7

The audit behind #7 covered buildPriceInfo and stopped there. Making a value nullable is only safe once everything that consumes it can take a null, and roundTo is the most widely shared of those consumers. Callers outside the method I changed were never checked.

Consumers

Needs the usual submodule bump. soon-market-api is the urgent one — it is where the 500 is. event-processor-contract should follow for consistency.

Verification

soon-market-api compiles against this source. The change cannot break an existing caller: anything passing a non-null value behaves exactly as before, and anything passing null was throwing.

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