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Implement prediction market event pipelines for slices 5-8 (Merge, Resolution, Redemption, Cancellation) (#13393)

* feat: implement prediction market event pipelines for slices 5-8

Implement the remaining four core domain slices for the Futarchy
prediction market integration:

- Slice 5 (Merge): TokensMerged EVM event pipeline — mapper, projection
  handler that inserts trades, decrements position balances, decrements
  market total_collateral
- Slice 6 (Resolution): ProposalResolved + MarketResolved EVM events,
  ResolvePredictionMarket command with author/admin auth and active
  status validation
- Slice 7 (Redemption): TokensRedeemed EVM event pipeline — mapper maps
  outcome to winning token, projection decrements winning token balance
- Slice 8 (Cancellation): CancelPredictionMarket command with
  author/admin auth, validates draft or active status

Also adds GetPredictionMarketTrades and GetPredictionMarketPositions
query endpoints, and exposes all new commands/queries via tRPC router
behind FLAG_FUTARCHY.

Completed GitHub issue #13392

Co-Authored-By: Claude <noreply@anthropic.com>

* docs: update plan

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: use string types for PG DECIMAL and DATE fields in prediction market query schemas

PostgreSQL returns DECIMAL(78,0) as strings and BigInt cannot be
JSON-serialized. Created View schemas that override PG_ETH fields with
z.string() for trade and position query outputs, matching the established
LaunchpadTradeView pattern. Documented the convention in CLAUDE.md.

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: view schema

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: rotorsoft <rotorsoft@outlook.com>
Co-authored-by: Claude <noreply@anthropic.com>

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