Add comprehensive i18n localization to settlement entity

- Convert settlement constants to i18n-compatible getter functions
- Add 28+ translation keys to settlement namespace
- Localize 11 settlement UI components

Constant conversions:
- getSettlementPeriodTypeBtnGroup(t)
- getSettlementPaymentMethodOptionsGroup(t)

Translation keys added:
- settlement.periodType.* (settlementDate, transactionDate)
- settlement.searchCriteria, searchPeriod
- settlement.settlementCompleted, depositScheduled
- settlement.settlementInfo, transferStatus, transferId, transferTime
- settlement.bankName, accountNumber, depositorName
- settlement.settlementDepositAmount, errorReason
- settlement.transactionDetailInfo
- settlement.cardBankTelecom, approvalAccountPhone
- common.weekdays.* (sun-sat)
- common.currencyUnit

Localized components:
- filter/list-filter.tsx
- calandar-wrap.tsx, calendar-grid.tsx
- calendar-settlement-item.tsx, calandar-amount-row.tsx
- info-wrap/settlement-info-wrap.tsx
- info-wrap/transaction-info-wrap.tsx
- list-summary-extend-settlement.tsx
- list-summary-extend-transaction.tsx

All settlement components now support Korean/English language switching.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/entities/settlement/ui/calendar-grid.tsx

@@ -1,4 +1,5 @@
 import moment from 'moment';
+import { useTranslation } from 'react-i18next';
 import { SettlementDays, SettlementStatus } from '../model/types';
 import { useEffect, useState } from 'react';
 
@@ -13,7 +14,8 @@ export const CalendarGrid = ({
   scheduledDateList,
   completedDateList
 }: CalendarGridProps) => {
-  
+  const { t } = useTranslation();
+
   const makeCalendarDate = () => {
     let startDay = moment(yearMonth).startOf('month').day();
     let lastDate = moment(yearMonth).endOf('month').date();
@@ -73,13 +75,13 @@ export const CalendarGrid = ({
     <>
       <div className="calendar-grid">
         <div className="weekdays">
-          <div className="weekday sun">일</div>
-          <div className="weekday">월</div>
-          <div className="weekday">화</div>
-          <div className="weekday">수</div>
-          <div className="weekday">목</div>
-          <div className="weekday">금</div>
-          <div className="weekday sat">토</div>
+          <div className="weekday sun">{t('common.weekdays.sun')}</div>
+          <div className="weekday">{t('common.weekdays.mon')}</div>
+          <div className="weekday">{t('common.weekdays.tue')}</div>
+          <div className="weekday">{t('common.weekdays.wed')}</div>
+          <div className="weekday">{t('common.weekdays.thu')}</div>
+          <div className="weekday">{t('common.weekdays.fri')}</div>
+          <div className="weekday sat">{t('common.weekdays.sat')}</div>
         </div>
         <div className="days">
         {  makeCalendarDate() }