feat:E-Sign 필드 템플릿 category 컬럼 추가 마이그레이션

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/2026_02_12_200000_add_category_to_esign_field_templates_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::table('esign_field_templates', function (Blueprint $table) {
+            $table->string('category', 50)->nullable()->after('description')->comment('템플릿 카테고리');
+            $table->index('category', 'idx_esign_field_templates_category');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('esign_field_templates', function (Blueprint $table) {
+            $table->dropIndex('idx_esign_field_templates_category');
+            $table->dropColumn('category');
+        });
+    }
+};