chore: 기타 모델/설정 보완

- PayrollSetting 모델 수정
- PptxController 수정

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

app/Http/Controllers/Additional/PptxController.php

@@ -19,7 +19,7 @@ class PptxController extends Controller
         '/var/www/docs/rules' => ['label' => '정책/규칙', 'source' => 'docs'],
         '/var/www/docs/guides' => ['label' => '가이드', 'source' => 'docs'],
         '/var/www/docs/projects' => ['label' => '프로젝트', 'source' => 'docs'],
-        '/var/www/docs/plans' => ['label' => '계획', 'source' => 'docs'],
+        '/var/www/docs/dev_plans' => ['label' => '계획', 'source' => 'docs'],
         '/var/www/mng/docs/pptx-output' => ['label' => '산출물', 'source' => 'mng'],
         '/var/www/mng/docs' => ['label' => '교육/문서', 'source' => 'mng'],
         '/var/www/mng/public/docs' => ['label' => '공개 문서', 'source' => 'mng'],

app/Models/HR/PayrollSetting.php

@@ -62,7 +62,7 @@ class PayrollSetting extends Model
 
     public function scopeForTenant($query, ?int $tenantId = null)
     {
-        $tenantId = $tenantId ?? session('selected_tenant_id', 1);
+        $tenantId = $tenantId ?? session('selected_tenant_id') ?? 1;
 
         return $query->where('tenant_id', $tenantId);
     }
@@ -73,7 +73,7 @@ public function scopeForTenant($query, ?int $tenantId = null)
 
     public static function getOrCreate(?int $tenantId = null): self
     {
-        $tenantId = $tenantId ?? session('selected_tenant_id', 1);
+        $tenantId = $tenantId ?? session('selected_tenant_id') ?? 1;
 
         return self::firstOrCreate(
             ['tenant_id' => $tenantId],