fix:Laravel 12 호환 - Doctrine DBAL 대신 DB::select 사용

- getDoctrineSchemaManager() 제거 (Laravel 12에서 미지원)
- 인덱스 존재 여부 확인을 SHOW INDEX 쿼리로 변경

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database/migrations/2026_01_30_150000_add_missing_columns_to_sales_scenario_checklists_table.php

@@ -3,6 +3,7 @@
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Facades\DB;
 
 return new class extends Migration
 {
@@ -62,26 +63,27 @@ public function up(): void
         });
 
         // 인덱스 추가 (이미 존재하면 무시)
-        Schema::table('sales_scenario_checklists', function (Blueprint $table) {
-            $sm = Schema::getConnection()->getDoctrineSchemaManager();
-            $indexes = $sm->listTableIndexes('sales_scenario_checklists');
-
-            // UNIQUE KEY 추가
-            if (!isset($indexes['sales_scenario_checkpoint_unique'])) {
+        // UNIQUE KEY 추가
+        $uniqueExists = DB::select("SHOW INDEX FROM sales_scenario_checklists WHERE Key_name = 'sales_scenario_checkpoint_unique'");
+        if (empty($uniqueExists)) {
+            Schema::table('sales_scenario_checklists', function (Blueprint $table) {
                 $table->unique(
                     ['tenant_id', 'scenario_type', 'step_id', 'checkpoint_id'],
                     'sales_scenario_checkpoint_unique'
                 );
-            }
+            });
+        }
 
-            // INDEX 추가
-            if (!isset($indexes['sales_scenario_checklists_tenant_id_scenario_type_index'])) {
+        // INDEX 추가
+        $indexExists = DB::select("SHOW INDEX FROM sales_scenario_checklists WHERE Key_name = 'sales_scenario_checklists_tenant_id_scenario_type_index'");
+        if (empty($indexExists)) {
+            Schema::table('sales_scenario_checklists', function (Blueprint $table) {
                 $table->index(
                     ['tenant_id', 'scenario_type'],
                     'sales_scenario_checklists_tenant_id_scenario_type_index'
                 );
-            }
-        });
+            });
+        }
     }
 
     /**