refactor: 엑셀 파일 형식 수정 및 형태 변경

Author: tnals0924

src/main/kotlin/site/billilge/api/backend/domain/payer/service/PayerService.kt

@@ -123,7 +123,7 @@ class PayerService(
         val headerTitles = arrayOf("이름", "학번")
         val sheetData = mutableMapOf<String, Pair<Array<String>, List<ExcelRow>>>()
 
-        for (year in startYear..currentYear) {
+        for (year in currentYear downTo startYear) {
             val yearText = "$year"
             val payersByYearExcelRow = payerRepository.findAllByEnrollmentYear(yearText)
                 .map { payer -> ExcelRow(payer.name, payer.studentId ?: "${yearText}XXXX") }

src/main/kotlin/site/billilge/api/backend/global/utils/ExcelGenerator.kt

@@ -49,6 +49,11 @@ class ExcelGenerator {
             cell.setCellValue(title)
             cell.cellStyle = headerCellStyle
         }
+
+        //이름 칸 너비
+        sheet.setColumnWidth(0, 10)
+        //학번 칸 너비
+        sheet.setColumnWidth(1, 16)
     }
 
     private fun fillData(sheet: SXSSFSheet, rows: List<ExcelRow>, columnSize: Int) {