feat:E-Sign 필드에 font_size 컬럼 추가

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

database/migrations/2026_02_13_070000_add_font_size_to_esign_fields_tables.php

@@ -0,0 +1,30 @@
+<?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_sign_fields', function (Blueprint $table) {
+            $table->unsignedSmallInteger('font_size')->nullable()->after('field_label')->comment('폰트 크기 (pt)');
+        });
+
+        Schema::table('esign_field_template_items', function (Blueprint $table) {
+            $table->unsignedSmallInteger('font_size')->nullable()->after('field_label')->comment('폰트 크기 (pt)');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('esign_sign_fields', function (Blueprint $table) {
+            $table->dropColumn('font_size');
+        });
+
+        Schema::table('esign_field_template_items', function (Blueprint $table) {
+            $table->dropColumn('font_size');
+        });
+    }
+};