Fix rental/sale income leaking into business accounts

[ParadauxIO]

Problem

Rental payments (and sale/auction/refund proceeds) were silently landing in business accounts instead of the landlord's personal balance.

TreasuryEconomyProvider.resolveRecipientAccount resolved every recipient by preferring GOVERNMENT > BUSINESS > PERSONAL among the accounts that UUID owns. A firm's BUSINESS account in the Business plugin is created as createAccount(AccountType.BUSINESS, proprietorUuid, ...) — i.e. owned by the proprietor's own player UUID. So any landlord who also runs a firm had getAccountsByOwner(landlordUuid) return both their PERSONAL and their firm's BUSINESS account, and the BUSINESS-over-PERSONAL preference routed their income into the firm.

All economy flows (rent, buy, auction bids, offers, refunds) funnel through this one method, so they were all affected.

Fix

Prefer the recipient's PERSONAL account first, falling back to the prior GOVERNMENT > BUSINESS > first-available ordering only when no personal account exists.

This is correct and minimal given two Treasury invariants:

• PERSONAL accounts are one-per-real-player.
• GOVERNMENT/SYSTEM accounts are owned by the virtual UUID (0,0), never a player.

So:

• Player landlord → always has a PERSONAL account → paid personally ✓ (leak fixed)
• Authority/government UUID (e.g. the configured default-*-authority-uuid) → no PERSONAL account → still falls through to GOVERNMENT ✓ (legitimate path preserved)

Also in this PR

• Add TreasuryEconomyProviderTest covering all three routing cases.
• Add treasury-api to the test classpath (it was compileOnly, so tests couldn't reference Treasury types).
• Fix RealtyPaperApiImplTest, which no longer compiled on main: ExecutorState gained a third component (networkExec) but the test still passed only two args. This was blocking the whole test module from compiling.

Testing

• ./gradlew :realty-paper:test — green (new test + previously-uncompilable suite).
• ./gradlew :realty-paper:shadowJar — builds.

Note: this only fixes routing going forward. Funds already mis-routed into business accounts won't move themselves — but since the affected landlords own those firms, they can withdraw/redirect the balances themselves.

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