refactor(bp): flatten BattlePassLevelEntry — drop misnamed RewardData jsonb

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.Database/Migrations/20260527015510_RefactorBattlePassLevels.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SVSim.Database.Migrations
+{
+    /// <inheritdoc />
+    public partial class RefactorBattlePassLevels : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(name: "RewardData", table: "BattlePassLevels");
+            migrationBuilder.AddColumn<int>(
+                name: "RequiredPoint", table: "BattlePassLevels",
+                type: "integer", nullable: false, defaultValue: 0);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(name: "RequiredPoint", table: "BattlePassLevels");
+            migrationBuilder.AddColumn<string>(
+                name: "RewardData", table: "BattlePassLevels",
+                type: "jsonb", nullable: false, defaultValue: "{}");
+        }
+    }
+}