feat: add start term update and cron schedule update

ApiDto/Common/CronUpdateSkip.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace Mirea.Api.Dto.Common;
+
+/// <summary>
+/// Represents a date or date range to skip during cron update scheduling.
+/// </summary>
+public class CronUpdateSkip
+{
+    /// <summary>
+    /// Gets or sets the start date of the skip range.
+    /// </summary>
+    public DateOnly? Start { get; set; }
+
+    /// <summary>
+    /// Gets or sets the end date of the skip range.
+    /// </summary>
+    public DateOnly? End { get; set; }
+
+    /// <summary>
+    /// Gets or sets a specific date to skip.
+    /// </summary>
+    public DateOnly? Date { get; set; }
+}