fix(API): Salary FormRequest 수정

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

app/Http/Requests/V1/Salary/BulkUpdateStatusRequest.php

@@ -29,4 +29,4 @@ public function messages(): array
             'status.in' => __('validation.in', ['attribute' => '상태']),
         ];
     }
-}
+}

app/Http/Requests/V1/Salary/UpdateSalaryRequest.php

@@ -30,4 +30,4 @@ public function rules(): array
             'status' => ['nullable', 'string', 'in:scheduled,completed'],
         ];
     }
-}
+}