fix(API): FormRequest 타입 및 검증 수정

- SendFcmRequest, PositionReorderRequest 수정
- TenantLogoUploadRequest, Salary Requests 수정
- StructureReview Requests 수정
- HandoverReport, SiteBriefing Requests 추가

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

app/Http/Requests/PositionReorderRequest.php

@@ -29,4 +29,4 @@ public function messages(): array
             'items.*.sort_order.required' => __('validation.required', ['attribute' => '정렬순서']),
         ];
     }
-}
+}