Fix government leasehold income routing and refund decimal-place rejection

[ParadauxIO]

This branch carries two related TreasuryEconomyProvider fixes.

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1. Route government leasehold income to the government account

Problem

The legacy plugin used real Minecraft accounts for government entities (e.g. DCGovernment). Those UUIDs own both a PERSONAL account (the original player) and the GOVERNMENT treasury account.

TreasuryEconomyProvider.resolveRecipientAccount preferred PERSONAL, so rent / sale income from government-owned leaseholds was paid into the player's personal balance instead of the government treasury. The same affected any government account with leaseholds.

Fix

Reorder recipient resolution to GOVERNMENT > PERSONAL > BUSINESS > first-available:

• Government landlords (own a GOVERNMENT account) → income routes to the government treasury.
• Ordinary landlords have no government account → still resolve to PERSONAL, so the earlier fix (rent must not leak into a firm BUSINESS account they own) is preserved.
• No accounts → resolve-or-create personal, unchanged.

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2. Fix "Amount cannot have more than 2 decimal places" on refunds

Problem

Players ending a lease early hit "Failed to process refund, Amount cannot have more than 2 decimal places."

The pro-rata refund is computed as lease.price() * remainingSeconds / totalSeconds (RealtyBackendImpl), which yields a double with arbitrary precision (e.g. 12.3456). transfer passed that straight through via BigDecimal.valueOf(amount), and Treasury rejects any amount with more than 2 decimal places.

Fix

Normalise the amount to 2 decimals at the transfer boundary — the single choke point where every realty amount becomes a BigDecimal for Treasury — so refunds and any other arithmetically-derived amount (e.g. prorated tax) are covered in one place:

BigDecimal normalisedAmount = BigDecimal.valueOf(amount).setScale(2, RoundingMode.HALF_UP);

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Tests

• Added legacyGovernment_withPersonalAndGovernmentAccount_routesToGovernment — owner with both PERSONAL + GOVERNMENT routes to GOVERNMENT.
• Existing landlordWithFirm_routesToPersonalNotBusiness still passes (no government account → PERSONAL).
• Fixed a pre-existing scale-sensitive amount assertion in the shared test helper (50.0 vs the provider's normalised 50.00), which was failing all four cases.

./gradlew :realty-paper:test --tests "*TreasuryEconomyProviderTest" → 4 passed, 0 failed.

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