feat: add phase five operations foundation

Tiku.Infrastructure/Backoffice/OperationAuditService.cs

@@ -0,0 +1,27 @@
+using Tiku.Application.Backoffice;
+using Tiku.Domain.Operations;
+using Tiku.Infrastructure.Persistence;
+
+namespace Tiku.Infrastructure.Backoffice;
+
+internal sealed class OperationAuditService(TikuDbContext dbContext) : IOperationAuditService
+{
+    public async Task WriteAsync(
+        BackofficeOperationAuditCommand command,
+        CancellationToken cancellationToken = default)
+    {
+        dbContext.AuditLogs.Add(new AuditLog
+        {
+            TenantId = command.TenantId,
+            ActorUserId = command.ActorUserId,
+            Action = command.Action.Trim(),
+            TargetType = command.TargetType?.Trim(),
+            TargetId = command.TargetId?.Trim(),
+            Details = command.Details,
+            IpAddress = command.IpAddress,
+            UserAgent = command.UserAgent
+        });
+
+        await dbContext.SaveChangesAsync(cancellationToken);
+    }
+}