Implement comprehensive audit logging for sensitive operations

[Smartdevs17]

Description

Sensitive operations lack audit trail. Implement structured audit logging with tamper-evident storage.

Acceptance Criteria

• Audit event schema with actor, action, resource, context
• Append-only log storage
• Audit query API with filtering
• Real-time alerting on critical events
• Log retention with archival policy
• Compliance reporting from audit log

Technical Scope

• backend/services/auditService.ts
• backend/services/
• src/
• Edge: log injection, storage cost, PII in audit logs, clock synchronization

[Dubemtopsite]

@Dubemtopsite has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Good day,

I will like to work on this issue and will be pleased if assigned

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Dubemtopsite to this issue.