fix(migrations): remove undiscoverable WorkOrderType backfill migration

Superseded by Phase0 (WorkOrderType as int) and Phase1 board indexes; keeping the bare Migration would either be skipped by EF or conflict if metadata were added.

Data.SeaHavenIndustries/Migrations/20260619150000_AddWorkOrderTypeAndScheduledDateIndex.cs

@@ -1,43 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-namespace Data.SeaHavenIndustries.Migrations
-{
-    public class AddWorkOrderTypeAndScheduledDateIndex : Migration
-    {
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.Sql("""
-                IF COL_LENGTH('workOrders', 'WorkOrderType') IS NULL
-                    ALTER TABLE workOrders ADD WorkOrderType varchar(50) NULL;
-                """);
-
-            migrationBuilder.Sql("""
-                IF NOT EXISTS (
-                    SELECT 1 FROM sys.indexes
-                    WHERE name = 'IX_workOrders_ScheduledDate'
-                      AND object_id = OBJECT_ID('workOrders'))
-                BEGIN
-                    CREATE INDEX IX_workOrders_ScheduledDate ON workOrders (ScheduledDate);
-                END
-                """);
-        }
-
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.Sql("""
-                IF EXISTS (
-                    SELECT 1 FROM sys.indexes
-                    WHERE name = 'IX_workOrders_ScheduledDate'
-                      AND object_id = OBJECT_ID('workOrders'))
-                    DROP INDEX IX_workOrders_ScheduledDate ON workOrders;
-                """);
-
-            migrationBuilder.Sql("""
-                IF COL_LENGTH('workOrders', 'WorkOrderType') IS NOT NULL
-                    ALTER TABLE workOrders DROP COLUMN WorkOrderType;
-                """);
-        }
-    }
-}

Data.SeaHavenIndustries/Migrations/20260701120000_Phase1_BoardIndexes.cs

@@ -5,7 +5,7 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Data.SeaHavenIndustries.Migrations
 {
     /// <inheritdoc />
-    public class Phase1_BoardIndexes : Migration
+    public partial class Phase1_BoardIndexes : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)