AdminAudit Repository

[hayesZach]

This PR implements the AdminAuditRepository interface and adds unit tests.

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Note

Introduces a working admin audit persistence layer and updates related domain types.

• Implement AdminAuditRepository with Create, Read, Delete, and List (filterable by target_action, target_resource_type, target_resource) in internal/repository/private/adminaudit.go
• Update models:
  • Add TargetResourceType enum and TargetActionUnknown
  • Reshape AdminAudit to use target_resource_type and string target_resource; switch details to RawJsonb
  • Add helpers: NewMarketplaceAdminAudit, NewKeyAdminAudit, NewReversalAdminAudit
  • Replace Jsonb with RawJsonb type and ToRawJsonb conversion
• Enhance dto:
  • Extend AdminAuditListOptions (resource type and string resource)
  • Add MarketplaceUpdateOptions.AuditDetails() returning RawJsonb
• Wire repository in private.go and include AdminAudit in migrations
• Add extensive unit tests for repository CRUD and listing filters; add testutil.MustRawJsonb

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