feat(pack): persist daily_free_gacha_count on PackChildGachaEntry

SVSim.Database/Migrations/20260609012522_AddPackChildGachaDailyFreeGachaCount.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SVSim.Database.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddPackChildGachaDailyFreeGachaCount : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "DailyFreeGachaCount",
+                table: "PackChildGachaEntry",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "DailyFreeGachaCount",
+                table: "PackChildGachaEntry");
+        }
+    }
+}

SVSim.Database/Migrations/SVSimDbContextModelSnapshot.cs

@@ -3441,6 +3441,9 @@ namespace SVSim.Database.Migrations
                             b1.Property<int>("Cost")
                                 .HasColumnType("integer");
 
+                            b1.Property<int>("DailyFreeGachaCount")
+                                .HasColumnType("integer");
+
                             b1.Property<int?>("FreeGachaCampaignId")
                                 .HasColumnType("integer");
 

SVSim.Database/Models/PackChildGachaEntry.cs

@@ -21,6 +21,7 @@ public class PackChildGachaEntry
     public bool IsDailySingle { get; set; }
     public int OverrideIncreaseGachaPoint { get; set; }
     public int PurchaseLimitCount { get; set; }
+    public int DailyFreeGachaCount { get; set; }
     public int? FreeGachaCampaignId { get; set; }
     public string? CampaignName { get; set; }
 }