Implement VM provision locking mechanism and enhance VM job handling

database/migrations/2026_07_13_000001_create_vm_provision_locks_table.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('vm_provision_locks', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('customer_id')->index();
+            $table->unsignedBigInteger('order_item_id')->unique();
+            $table->enum('status', ['running', 'success', 'failed'])->default('running');
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('vm_provision_locks');
+    }
+};