Add LeaveCount column to LeaveBeginnings table

- Introduced a new column 'LeaveCount' of type int to the LeaveBeginnings table.
- Set default value to 0 and added a comment for clarity in Thai: "จำนวนครั้งที่ลาสะสม".

BMA.EHR.Infrastructure/Migrations/LeaveDb/20260205034753_Add LeaveCount to LeaveBeginning.cs

@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace BMA.EHR.Infrastructure.Migrations.LeaveDb
+{
+    /// <inheritdoc />
+    public partial class AddLeaveCounttoLeaveBeginning : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "LeaveCount",
+                table: "LeaveBeginnings",
+                type: "int",
+                nullable: false,
+                defaultValue: 0,
+                comment: "จำนวนครั้งที่ลาสะสม");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "LeaveCount",
+                table: "LeaveBeginnings");
+        }
+    }
+}