#58 API: Get User Audit Trail

Implement endpoint to get complete audit trail for a specific user. Endpoint: GET /api/v1/users/{user_id}/audit Query Parameters: - from_date: Start date (optional) - to_date: End date (optional) - page: Page number (default: 1) - per_page: Results per page (default: 50) Response: All actions performed by OR on this user Required Permissions: tenant_admin, system_admin, or self Implementation Requirements: - Include actions user performed - Include actions done TO user (role changes, etc.) - Timeline view friendly format - Include IP addresses when available - Include user agent strings With ultra attention to details and correctness. Before closing: write comment summarizing implementation with screenshot.