feat(tips,indexer): tip status lifecycle, cursor pagination, DTO serializer, indexer cursor tests

[bade2brazy]

Closes #880

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Closes #881

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Closes #886

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Closes #892

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Summary

• Indexer: Indexer cursor persistence #892 — Indexer cursor persistence: adds cursor.test.ts (unit tests for getCursorLedger/setCursorLedger) and projections.test.ts (idempotency fixtures proving re-running over the same ledger range produces no duplicate rows)
• Tips: Tip response DTO + serializer #886 — Tip response DTO + serializer: new tips.dto.ts (TipResponseDto interface) and tips.serializer.ts (serializeTip pure function converting BigInt→string, Date→ISO 8601, adds status field); refactors tips.service.ts to use the serializer throughout; new tips.serializer.test.ts with 7 unit tests
• Tips: Tip status lifecycle (pending→confirmed) #880 — Tip status lifecycle: adds confirmTip(txHash) service function (PENDING→CONFIRMED, idempotent), confirmTipParamSchema, confirm controller, and PATCH /tips/:txHash/confirm route with OpenAPI spec entry
• Tips: Tip pagination (cursor-based) #881 — Tip pagination (cursor-based): expands test coverage with cursor-chain tests (verifies nextCursor from page 1 is forwarded to Prisma as { cursor: { id }, skip: 1 } on page 2), non-cuid cursor rejection, and last-page null-cursor assertions

Test plan

• cursor.test.ts — get null when no row, get stored ledger, upsert shape, idempotent writes, monotonic advance
• projections.test.ts — new event persisted + Tip upserted, duplicate event log skipped on replay, Tip upsert still fires (no-op), non-tip topics skip Tip upsert, unparseable value handled gracefully, tip alias treated same as tip_sent
• tips.serializer.test.ts — BigInt→string, Date→ISO, status/message fields
• tips.test.ts — confirm 404 (not found), 200 PENDING→CONFIRMED (calls update), 200 idempotent on CONFIRMED (skips update), cursor chain page 1→2 passes correct Prisma args, non-cuid cursor returns 400, last-page nextCursor is null

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