feat: API Flow Tester 테이블 마이그레이션 추가

- admin_api_flows: 플로우 정의 저장 테이블
- admin_api_flow_runs: 실행 이력 및 로그 테이블

database/migrations/2025_11_27_100000_create_admin_api_flow_tables.php

@@ -0,0 +1,70 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * API Flow Tester 기능을 위한 테이블 생성 (MNG 전용)
+     * - admin_api_flows: 플로우 정의 저장
+     * - admin_api_flow_runs: 실행 이력 및 로그
+     */
+    public function up(): void
+    {
+        // admin_api_flows: 플로우 정의 테이블
+        Schema::create('admin_api_flows', function (Blueprint $table) {
+            $table->id()->comment('ID');
+            $table->string('name', 100)->comment('플로우 이름');
+            $table->text('description')->nullable()->comment('설명');
+            $table->string('category', 50)->nullable()->comment('카테고리');
+            $table->json('flow_definition')->comment('플로우 정의 (JSON)');
+            $table->boolean('is_active')->default(true)->comment('활성화 여부');
+            $table->foreignId('created_by')->nullable()->comment('생성자 ID');
+            $table->foreignId('updated_by')->nullable()->comment('수정자 ID');
+            $table->timestamps();
+
+            // 인덱스
+            $table->index('category', 'idx_admin_api_flows_category');
+            $table->index('is_active', 'idx_admin_api_flows_is_active');
+            $table->index('name', 'idx_admin_api_flows_name');
+        });
+
+        // admin_api_flow_runs: 실행 이력 테이블
+        Schema::create('admin_api_flow_runs', function (Blueprint $table) {
+            $table->id()->comment('ID');
+            $table->foreignId('flow_id')->comment('플로우 ID')
+                ->constrained('admin_api_flows')
+                ->onDelete('cascade');
+            $table->string('status', 20)->default('PENDING')->comment('상태: PENDING, RUNNING, SUCCESS, FAILED, PARTIAL');
+            $table->timestamp('started_at')->nullable()->comment('시작 시간');
+            $table->timestamp('completed_at')->nullable()->comment('완료 시간');
+            $table->unsignedInteger('duration_ms')->nullable()->comment('실행 시간 (ms)');
+            $table->unsignedSmallInteger('total_steps')->nullable()->comment('총 단계 수');
+            $table->unsignedSmallInteger('completed_steps')->default(0)->comment('완료된 단계 수');
+            $table->unsignedSmallInteger('failed_step')->nullable()->comment('실패한 단계');
+            $table->json('execution_log')->nullable()->comment('실행 로그 (단계별 결과)');
+            $table->json('input_variables')->nullable()->comment('입력 변수');
+            $table->text('error_message')->nullable()->comment('에러 메시지');
+            $table->foreignId('executed_by')->nullable()->comment('실행자 ID');
+            $table->timestamp('created_at')->useCurrent()->comment('생성 시간');
+
+            // 인덱스
+            $table->index('flow_id', 'idx_admin_api_flow_runs_flow_id');
+            $table->index('status', 'idx_admin_api_flow_runs_status');
+            $table->index('created_at', 'idx_admin_api_flow_runs_created_at');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('admin_api_flow_runs');
+        Schema::dropIfExists('admin_api_flows');
+    }
+};