feat: implement ResolutionService.resolveFight and ResolutionService.…

[whiteghost0001]

…handleDispute

Closes #1083
Closes #1084

Detailed Explanation of Changes:

1. Issue B-25: Implement ResolutionService.resolveFight #1083 (B-25) — Implement ResolutionService.resolveFight:

   • What was done: Implemented ResolutionService.resolveFight() to handle market fight outcome resolutions initiated by admin actions.
   • How it was done:
     • Added ResolutionService class and resolveFight method in backend/src/services/resolution.service.ts.
     • Implemented submitResolution in backend/src/services/oracle.service.ts to persist OracleResult entries and set market status to Resolved. * Wired ResolutionService.resolveFight to perform optimistic cache updates (optimisticMarketCache) for instant state retrieval before DB persistence. * Integrated with resolveMarketHandler in backend/src/api/controllers/market.controller.ts, which is routed via admin-authenticated endpoints (/api/admin/markets/resolve) guarded by adminAuth / requireAdmin middleware to enforce that resolution is only callable by authorized admins.

2. Issue B-26: Implement ResolutionService.handleDispute #1084 (B-26) — Implement ResolutionService.handleDispute:

   • What was done: Implemented ResolutionService.handleDispute() to process admin review decisions on disputed markets.
   • How it was done:
     • Added handleDispute method in backend/src/services/resolution.service.ts accepting disputeId, outcome, admin, and notes.
     • Enforced strict validation requiring decision notes explaining the resolution outcome. * Invoked oracleService.resolveDispute for dispute resolution and market status finalization. * Executed a database transaction storing the decision notes in Dispute.resolution and logging the action to both AdminLog (action: "handleDispute") and AuditLog for complete auditability. * Wired resolveDisputeHandler in backend/src/api/controllers/market.controller.ts to receive dispute resolution requests from admin-authenticated routes (/api/admin/markets/dispute/resolve).