tests: Pact verification for distributions and payouts

[heymide]

Close: #561

Implementation complete. Here's a summary:
Files created/modified:

1. src/routes/tests/pact-distributions-payouts.test.ts — Pact provider verification tests (10 tests, all passing). Uses:

• Verifier from @pact-foundation/pact to validate provider against consumer contracts
• Stateful mock repositories (StatefulPayoutRepo) that respond based on provider state set via POST /__state
• Supports both local pact files (PACT_DIR env) and Pact Broker (PACT_BROKER_URL + PACT_BROKER_TOKEN env)
• 5 verified interactions: successful distribution, successful payouts, empty payouts, unauthorized distribution, unauthorized payouts

2. pacts/revora-consumer-revora-backend.json — Consumer Pact contract (Pact spec v2) defining 5 expected interactions across both endpoints
3. package.json — Added @pact-foundation/pact@^17.0.1 dev dependency
   Key design decisions:

• Routes mounted at root (app.use(createDistributionsRouter(...))) since they already contain full paths
• Provider state handler returns 200 for unknown/empty state to handle unauthorized interactions (which have no provider state)
• Sorting order matched to default created_at desc in the contract
• All existing tests pass (228 tests across distributions/payouts suites)

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[heymide]

Done, Close: #637