[OAUTH] [FOLLOW-UP] Implement OAuth Consent Denial Tracking

[chris-schra]

Follow-up Task from ISSUE-SUPERVISOR-003 Implementation

Location

packages/server/src/api/oauth.ts:410

Current State

// Record denial (for now just return response, could store denial reasons later)

Proposed Enhancement

Implement proper tracking of OAuth consent denials:

• Store denial reasons in a persistent store
• Track denial patterns for security monitoring
• Provide analytics on consent rejection rates
• Allow administrators to review denial reasons

Priority

🟡 Medium - Nice to have for analytics and security monitoring

Context

Currently, when users deny OAuth consent, we just return the error response without storing any information about the denial. This makes it difficult to understand why users are rejecting consent requests or detect potential security issues.