feat: [document] 블록 빌더 지원 마이그레이션 추가

- document_templates: builder_type, schema, page_config 컬럼 추가
- documents: data JSON, rendered_html, pdf_path 컬럼 추가

database/migrations/2026_02_28_100000_add_block_builder_to_document_templates.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('document_templates', function (Blueprint $table) {
+            $table->string('builder_type', 20)->default('legacy')->after('category')
+                ->comment('빌더 유형 (legacy: 기존 EAV, block: 블록 빌더)');
+            $table->json('schema')->nullable()->after('footer_judgement_options')
+                ->comment('블록 빌더 JSON 스키마');
+            $table->json('page_config')->nullable()->after('schema')
+                ->comment('페이지 설정 (용지 크기, 방향, 여백 등)');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('document_templates', function (Blueprint $table) {
+            $table->dropColumn(['builder_type', 'schema', 'page_config']);
+        });
+    }
+};

database/migrations/2026_02_28_100001_add_block_data_to_documents.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('documents', function (Blueprint $table) {
+            $table->json('data')->nullable()->after('status')
+                ->comment('블록 빌더 문서 데이터 (JSON)');
+            $table->longText('rendered_html')->nullable()->after('data')
+                ->comment('렌더링된 HTML (PDF 생성용 캐시)');
+            $table->string('pdf_path', 500)->nullable()->after('rendered_html')
+                ->comment('생성된 PDF 파일 경로');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('documents', function (Blueprint $table) {
+            $table->dropColumn(['data', 'rendered_html', 'pdf_path']);
+        });
+    }
+};