Cap order money counted toward sell multipliers

[Faboit1]

Fix from a duplication/economy audit.

Problem (High, economy exploit)

With orders.count-toward-multipliers: true (the default), every dollar an order paid counted toward the seller's category multiplier progress. An order's price is whatever its owner typed, so two accounts could:

1. Account A opens an order for diamonds at $100,000 each.
2. Account B sells 64 diamonds into it, gaining $6.4M of multiplier progress for items the shop values at a few thousand.
3. B sends the money back to A, and they repeat.

The money just goes back and forth between the two accounts, but B's multiplier keeps climbing, which permanently raises everything B sells to the shop.

Fix

Each sale's order earnings count toward progress for no more than the shop would have paid for those same items. StackSale now carries that figure (orderShopValue), and SaleTally counts min(orderEarned, orderShopValue). The option keeps its meaning: selling through an order still counts like selling to the shop, just not for more. The order still pays its full price.

Testing

Paper 1.21.10 with FoOrders and a connected client, selling 64 diamonds into a $100,000/each order:

	main	this PR
seller paid	$6,400,000	$6,400,000
multiplier progress gained	+6,400,000	+20,736 (= shop value of 64)

The existing sell-into-orders scenarios all still pass.

The companion FoOrders fixes are in Faboit1/FoOrders-Folia (same branch name).

🤖 Generated with Claude Code

https://claude.ai/code/session_01U5jqQqtiAZknExc2x6jFwQ

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