Fix duplicate changedOrderToJob migration blocking build

Two divergent copies of this branch each independently regenerated an
EF migration named changedOrderToJob, and merging both left two files
with the same C# class name (compile error) plus an orphaned
fixedOrderCustomerID migration referencing the already-renamed orders
table. Removed the dead/unapplied migrations, committed the two
migrations already live on the shared dev DB, and added
FixJobsCustomerIdType to bring jobs.customer_id in line with the model
(text -> integer) using an explicit USING cast.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

barkmanAPI/Migrations/20260723200239_maybethisworks.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace barkmanapi.Migrations
+{
+    /// <inheritdoc />
+    public partial class maybethisworks : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}