security: audit log lacks deterministic rotation & quota enforcement

[nanaf6203-bit]

Summary

src/utils/security/auditLogger.ts keeps an audit log in localStorage with no obvious rotation or eviction policy.

Affected area

src/utils/security/auditLogger.ts (private cleanupOldLogs)

Steps to reproduce / impact

Quota exhaustion will silently drop log entries, defeating the audit guarantee. Without a strict, tested rotation policy, the most recent (most important) entries can be evicted first.

Expected behaviour

Implement LRU-by-time with size cap; surface a warning when eviction begins; export to remote sink before eviction.

Acceptance criteria

• Tests for rotation behaviour.
• Documentation of the audit retention policy.

[sandrawillow001-afk]

@sandrawillow001-afk has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

will love to work on this issue sir

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