Implemented role mapping, updated the audit log schema, and enhanced the issue approval interface with ownership transfer details.

This update introduces flexible role mappings, updates our core audit schema, and upgrades the issue approval flow with clear ownership details.
We have refactored access controls and approvals to support fine-grained permissions and trace ownership changes transparently.
Strengthening approval clarity and role structure helps operations run securely and reduces friction during team handovers.
Next, we'll expand our role mapping capabilities to support dynamic team group assignments.