feat: [payroll] payrolls 테이블에 long_term_care 컬럼 추가

database/migrations/2026_02_27_100001_add_long_term_care_to_payrolls_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('payrolls', function (Blueprint $table) {
+            $table->decimal('long_term_care', 12, 0)->default(0)->after('health_insurance');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('payrolls', function (Blueprint $table) {
+            $table->dropColumn('long_term_care');
+        });
+    }
+};