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/Admin/SendFcmRequest.php

@@ -34,4 +34,4 @@ public function messages(): array
             'platform.in' => __('validation.in', ['attribute' => '플랫폼']),
         ];
     }
-}
+}