feat: [approval] approvals 테이블에 resubmit_count 컬럼 추가

database/migrations/2026_03_05_160000_add_resubmit_count_to_approvals_table.php

@@ -0,0 +1,22 @@
+<?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::table('approvals', function (Blueprint $table) {
+            $table->unsignedTinyInteger('resubmit_count')->default(0)->after('current_step');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('approvals', function (Blueprint $table) {
+            $table->dropColumn('resubmit_count');
+        });
+    }
+};