feat(account): 대출 실행금액 필드 추가 + 상환방식별 자동계산 분기

- loan_amount(대출 실행 금액) 컬럼 추가(DB/도메인/DTO/mapper)
- 계좌 폼: 대출 실행 금액 입력 / 기록 시작 시 잔액(기존 openingBalance) 레이블 분리
- 계좌 카드: 실행금액·금리·상환방식 표시
- 상환 자동계산 3방식 분기:
  - 원리금균등: 납입금액 입력 → 이자(잔액×월이율) / 원금(납입-이자) 분리
  - 원금균등: 실행금액÷기간=월원금, 잔액×월이율=이자 자동계산
  - 만기일시: 잔액×월이율=이자만 자동계산, 원금 0
- 자동계산 후 이자·원금 수동 조정 가능

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/views/account/AccountView.vue

@@ -1,4 +1,4 @@
-<script setup>
+1<script setup>
 import { computed, nextTick, onMounted, reactive, ref, watch } from 'vue'
 import { accountApi } from '@/api/accountApi'
 import { reminders } from '@/native/reminders'
@@ -127,6 +127,56 @@ const repayTargetIsCard = computed(() => {
   const w = wallets.value.find((x) => x.id === form.toWalletId)
   return !!w && w.type === 'CARD'
 })
+// 금리가 설정된 대출 계좌를 선택한 경우 자동계산 활성
+const repayTargetLoanWallet = computed(() => {
+  const w = wallets.value.find((x) => x.id === form.toWalletId)
+  return w?.type === 'LOAN' && w.loanRate ? w : null
+})
+// 납입금액 입력용 (원리금균등만 사용)
+const loanPaymentAmount = ref(null)
+
+function monthlyInterestOf(loan) {
+  return Math.round(Math.abs(loan.balance || 0) * (Number(loan.loanRate) / 100 / 12))
+}
+
+// 상환방식별 자동계산: 원금균등·만기일시는 납입금액 입력 불필요
+const loanAutoResult = computed(() => {
+  const loan = repayTargetLoanWallet.value
+  if (!loan) return null
+  const interest = monthlyInterestOf(loan)
+  if (loan.loanMethod === 'BULLET') {
+    return { interest, principal: 0, total: interest, needsInput: false }
+  }
+  if (loan.loanMethod === 'EQUAL_PRINCIPAL' && loan.loanAmount && loan.loanMonths) {
+    const principal = Math.round(Number(loan.loanAmount) / loan.loanMonths)
+    return { interest, principal, total: principal + interest, needsInput: false }
+  }
+  return { interest: null, principal: null, total: null, needsInput: true }
+})
+
+watch(loanAutoResult, (r) => {
+  if (r && !r.needsInput) {
+    form.interest = r.interest
+    form.principal = r.principal
+    loanPaymentAmount.value = r.total
+  }
+})
+
+function calcLoanRepayment(payment) {
+  const loan = repayTargetLoanWallet.value
+  if (!loan || !payment || payment <= 0) return
+  const interest = monthlyInterestOf(loan)
+  form.interest = Math.min(interest, payment)
+  form.principal = Math.max(0, payment - form.interest)
+}
+watch(loanPaymentAmount, (val) => {
+  if (loanAutoResult.value?.needsInput && val) calcLoanRepayment(Number(val))
+})
+watch(() => form.toWalletId, () => {
+  loanPaymentAmount.value = null
+  form.principal = null
+  form.interest = null
+})
 // 카드 지출일 때만 할부 입력 노출 (2~24개월, 일시불은 빈값)
 const showInstallment = computed(() => form.type === 'EXPENSE' && form.walletKind === 'CARD')
 const installmentMonthly = computed(() => {
@@ -282,7 +332,19 @@ const categoryMajor = ref('') // 펼쳐진 대분류 이름
 const majorOptionsData = computed(() =>
   categories.value.filter((c) => c.type === form.type && c.parentId == null)
 )
-// 특정 대분류의 소분류 객체 목록
+// 대분류를 4개씩 행으로 묶음
+const majorRows = computed(() => {
+  const items = majorOptionsData.value
+  const rows = []
+  for (let i = 0; i < items.length; i += 4) rows.push(items.slice(i, i + 4))
+  return rows
+})
+// 현재 펼쳐진 대분류 객체
+const selectedMajorObj = computed(() =>
+  majorOptionsData.value.find((m) => m.name === categoryMajor.value) ?? null
+)
+
+// 특정 대분류의 소분류 목록
 function subsByMajor(majorId) {
   return categories.value.filter((c) => c.parentId === majorId)
 }
@@ -318,10 +380,19 @@ const allCategoryNames = computed(() => [...new Set(categories.value.map((c) =>
 
 // 모달 내 분류 인라인 추가
 const addingCategory = ref(false)
+const addingAsMajor = ref(true) // true=대분류 추가, false=소분류 추가
 const newCategoryName = ref('')
 const catSubmitting = ref(false)
-function startAddCategory() {
+function startAddMajorCategory() {
+  categoryMajor.value = ''
+  form.category = ''
   newCategoryName.value = ''
+  addingAsMajor.value = true
+  addingCategory.value = true
+}
+function startAddSubCategory() {
+  newCategoryName.value = ''
+  addingAsMajor.value = false
   addingCategory.value = true
 }
 function cancelAddCategory() {
@@ -1114,39 +1185,67 @@ onMounted(async () => {
                     </option>
                   </select>
                 </label>
+                <!-- 금리 설정된 대출 계좌: 방식별 자동계산 -->
+                <template v-if="repayTargetLoanWallet">
+                  <!-- 원리금균등: 납입금액 직접 입력 -->
+                  <template v-if="loanAutoResult?.needsInput">
+                    <label>납입금액(원리금균등)
+                      <input v-model.number="loanPaymentAmount" type="number" min="0"
+                        placeholder="이번 달 납입할 총금액" :disabled="submitting" />
+                    </label>
+                  </template>
+                  <!-- 원금균등·만기일시: 자동계산 결과 표시 -->
+                  <template v-else>
+                    <div class="loan-breakdown">
+                      <span class="bd-label">{{ repayTargetLoanWallet.loanMethod === 'BULLET' ? '만기일시' : '원금균등' }} 자동계산</span>
+                      <span>납입 <b>{{ (loanAutoResult?.total || 0).toLocaleString('ko-KR') }}원</b></span>
+                    </div>
+                  </template>
+                  <!-- 계산 결과 표시 + 수동 조정 -->
+                  <div v-if="(form.interest ?? null) !== null || (form.principal ?? null) !== null" class="loan-breakdown">
+                    <span>이자 <b>{{ (form.interest || 0).toLocaleString('ko-KR') }}원</b></span>
+                    <span>원금 <b>{{ (form.principal || 0).toLocaleString('ko-KR') }}원</b></span>
+                  </div>
+                  <label>이자(조정)<input v-model.number="form.interest" type="number" min="0" :disabled="submitting" /></label>
+                  <label>원금(조정)<input v-model.number="form.principal" type="number" min="0" :disabled="submitting" /></label>
+                </template>
+                <template v-else>
                   <label>원금<input v-model.number="form.principal" type="number" min="0" placeholder="원 (이체로 기록)" :disabled="submitting" /></label>
                   <label>이자<input v-model.number="form.interest" type="number" min="0" placeholder="원 (지출·분류 이자)" :disabled="submitting" /></label>
+                </template>
                 <label v-if="repayTargetIsCard">연회비<input v-model.number="form.annualFee" type="number" min="0" placeholder="원 (지출·분류 연회비)" :disabled="submitting" /></label>
               </template>
 
               <label v-if="form.type === 'INCOME' || form.type === 'EXPENSE'">분류
-                <div v-if="!addingCategory" class="cat-accordion">
-                  <div v-for="m in majorOptionsData" :key="m.id" class="acc-major">
+                <div v-if="!addingCategory" class="cat-picker">
+                  <!-- 대분류 행별 렌더링: 선택된 대분류가 속한 행 바로 아래 소분류 삽입 -->
+                  <template v-for="(row, rowIdx) in majorRows" :key="rowIdx">
+                    <div class="acc-major-grid">
                       <button
-                      type="button" class="acc-major-btn"
-                      :class="{ active: form.category === m.name && !subsByMajor(m.id).length, expanded: categoryMajor === m.name && subsByMajor(m.id).length }"
+                        v-for="m in row" :key="m.id"
+                        type="button" class="acc-chip major"
+                        :class="{ active: categoryMajor === m.name }"
                         :disabled="submitting"
                         @click="onMajorClick(m)"
-                    >
-                      <span class="acc-arrow">{{ subsByMajor(m.id).length ? (categoryMajor === m.name ? '▼' : '▶') : '' }}</span>
-                      {{ m.name }}
-                    </button>
-                    <div v-if="categoryMajor === m.name && subsByMajor(m.id).length" class="acc-subs">
+                      >{{ m.name }}</button>
+                    </div>
+                    <div v-if="selectedMajorObj && row.some(m => m.id === selectedMajorObj.id) && subsByMajor(selectedMajorObj.id).length" class="acc-sub-grid">
                       <button
-                        v-for="s in subsByMajor(m.id)" :key="s.id"
-                        type="button" class="acc-sub-btn"
+                        v-for="s in subsByMajor(selectedMajorObj.id)" :key="s.id"
+                        type="button" class="acc-chip sub"
                         :class="{ active: form.category === s.name }"
                         :disabled="submitting"
                         @click="form.category = s.name"
                       >{{ s.name }}</button>
+                      <button type="button" class="acc-chip add-chip sub-add" :disabled="submitting" @click="startAddSubCategory">+ 소분류</button>
                     </div>
-                  </div>
-                  <button type="button" class="cat-add-btn acc-add" :disabled="submitting" @click="startAddCategory">+ 추가</button>
+                  </template>
+                  <button type="button" class="acc-chip add-chip" :disabled="submitting" @click="startAddMajorCategory">+ 대분류</button>
                 </div>
                 <div v-else class="cat-input">
                   <input
                     v-model="newCategoryName" type="text"
-                    :placeholder="form.type === 'EXPENSE' ? '새 지출 분류' : '새 수입 분류'"
+                    :placeholder="addingAsMajor ? (form.type === 'EXPENSE' ? '새 지출 대분류' : '새 수입 대분류') : `${categoryMajor} > 새 소분류`"
                     :disabled="catSubmitting" @keyup.enter.prevent="confirmAddCategory"
                   />
                   <button type="button" class="cat-add-btn primary" :disabled="catSubmitting" @click="confirmAddCategory">확인</button>
@@ -1896,78 +1995,77 @@ button.primary {
   border-color: hsla(160, 100%, 37%, 1);
   color: hsla(160, 100%, 37%, 1);
 }
-/* 분류 아코디언 */
-.cat-accordion {
-  border: 1px solid var(--color-border);
-  border-radius: 6px;
-  overflow: hidden;
-  max-height: 200px;
-  overflow-y: auto;
-}
-.acc-major-btn {
-  width: 100%;
-  display: flex;
-  align-items: center;
-  gap: 0.35rem;
-  padding: 0.45rem 0.7rem;
-  border: 0;
-  border-bottom: 1px solid var(--color-border);
-  background: transparent;
-  cursor: pointer;
-  text-align: left;
-  font-size: 0.88rem;
-  color: var(--color-text);
-}
-.acc-major-btn:last-child {
-  border-bottom: 0;
-}
-.acc-major-btn.active,
-.acc-major-btn.expanded {
-  background: var(--color-background-soft);
-  font-weight: 600;
-}
-.acc-major-btn.active {
-  color: hsla(160, 100%, 37%, 1);
-}
-.acc-arrow {
-  font-size: 0.6rem;
-  flex: none;
-  width: 0.9rem;
-  text-align: center;
-  opacity: 0.6;
-}
-.acc-subs {
+/* 분류 칩 그리드 */
+.cat-picker {
   display: flex;
   flex-direction: column;
+  gap: 0.4rem;
 }
-.acc-sub-btn {
-  padding: 0.38rem 0.7rem 0.38rem 2rem;
-  border: 0;
-  border-bottom: 1px solid var(--color-border);
+.acc-major-grid,
+.acc-sub-grid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.35rem;
+}
+.acc-sub-grid {
+  padding: 0.4rem;
+  border-radius: 6px;
   background: var(--color-background-soft);
+}
+.acc-chip {
+  flex: 1 1 calc(25% - 0.35rem);
+  min-width: 0;
+  padding: 0.38rem 0.4rem;
+  border: 1px solid var(--color-border);
+  border-radius: 6px;
+  background: transparent;
   cursor: pointer;
-  text-align: left;
-  font-size: 0.84rem;
+  font-size: 0.82rem;
   color: var(--color-text);
+  text-align: center;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
-.acc-sub-btn:last-child {
-  border-bottom: 0;
-}
-.acc-sub-btn.active {
+.acc-chip.major.active {
+  border-color: hsla(160, 100%, 37%, 1);
+  background: hsla(160, 100%, 37%, 0.1);
   color: hsla(160, 100%, 37%, 1);
   font-weight: 600;
 }
-.acc-add {
-  display: block;
-  width: 100%;
-  border: 0;
-  border-top: 1px dashed var(--color-border);
-  border-radius: 0;
-  background: transparent;
-  text-align: center;
+.acc-chip.sub {
+  background: var(--color-background);
+}
+.acc-chip.sub.active {
+  border-color: hsla(160, 100%, 37%, 1);
+  background: hsla(160, 100%, 37%, 0.1);
+  color: hsla(160, 100%, 37%, 1);
+  font-weight: 600;
+}
+.acc-chip.add-chip {
+  opacity: 0.55;
+  border-style: dashed;
+}
+.acc-chip.add-chip.sub-add {
+  flex: 0 0 auto;
+}
+.loan-breakdown {
+  display: flex;
+  gap: 1rem;
+  padding: 0.45rem 0.6rem;
+  border-radius: 6px;
+  background: var(--color-background-soft);
+  font-size: 0.85rem;
   color: var(--color-text);
+}
+.loan-breakdown b {
+  color: hsla(160, 100%, 37%, 1);
+}
+.loan-breakdown .bd-label {
+  width: 100%;
+  font-size: 0.78rem;
   opacity: 0.6;
-  font-size: 0.82rem;
+  margin-bottom: 0.1rem;
 }
 .tag-field {
   display: flex;

src/views/account/AccountWalletView.vue

@@ -33,6 +33,12 @@ const form = reactive({
   openingBalance: 0,
   openingDate: '',
   currentValue: null,
+  // 대출(LOAN) 전용
+  loanAmount: null,
+  loanRate: null,
+  loanMethod: '',
+  loanMonths: null,
+  loanStart: '',
 })
 const submitting = ref(false)
 const formError = ref(null)
@@ -196,7 +202,7 @@ function issuerLabel(t) {
   return t === 'BANK' ? '은행명' : t === 'CARD' ? '카드사' : t === 'INVEST' ? '증권사' : '대출기관'
 }
 function openingLabel(t) {
-  return t === 'BANK' || t === 'CASH' ? '초기 잔액' : t === 'CARD' ? '초기 미결제 금액' : t === 'INVEST' ? '투자금(투입원금)' : '대출 잔액(원금)'
+  return t === 'BANK' || t === 'CASH' ? '초기 잔액' : t === 'CARD' ? '초기 미결제 금액' : t === 'INVEST' ? '투자금(투입원금)' : '기록 시작 시 잔액'
 }
 // 투자 수익률(%) — 투입원금 대비 평가손익
 function returnPct(w) {
@@ -229,6 +235,11 @@ function openCreate() {
     openingBalance: 0,
     openingDate: '',
     currentValue: null,
+    loanAmount: null,
+    loanRate: null,
+    loanMethod: '',
+    loanMonths: null,
+    loanStart: '',
   })
   formError.value = null
   formOpen.value = true
@@ -245,6 +256,11 @@ function openEdit(w) {
     openingBalance: isLiability(w.type) ? -(w.openingBalance || 0) : w.openingBalance || 0,
     openingDate: w.openingDate || '',
     currentValue: w.currentValue ?? null,
+    loanAmount: w.loanAmount ?? null,
+    loanRate: w.loanRate ?? null,
+    loanMethod: w.loanMethod || '',
+    loanMonths: w.loanMonths ?? null,
+    loanStart: w.loanStart || '',
   })
   formError.value = null
   formOpen.value = true
@@ -258,6 +274,7 @@ async function submit() {
   }
   submitting.value = true
   const magnitude = Number(form.openingBalance) || 0
+  const isLoan = form.type === 'LOAN'
   const payload = {
     type: form.type,
     name: form.name.trim(),
@@ -271,6 +288,11 @@ async function submit() {
       form.type === 'INVEST' && form.currentValue !== '' && form.currentValue != null
         ? Number(form.currentValue)
         : null,
+    loanAmount: isLoan && form.loanAmount ? Number(form.loanAmount) : null,
+    loanRate: isLoan && form.loanRate !== null && form.loanRate !== '' ? Number(form.loanRate) : null,
+    loanMethod: isLoan && form.loanMethod ? form.loanMethod : null,
+    loanMonths: isLoan && form.loanMonths ? Number(form.loanMonths) : null,
+    loanStart: isLoan && form.loanStart ? form.loanStart : null,
   }
   try {
     if (editId.value) await accountApi.updateWallet(editId.value, payload)
@@ -297,6 +319,9 @@ async function remove(w) {
 function cardTypeLabel(v) {
   return v === 'CHECK' ? '체크' : v === 'CREDIT' ? '신용' : ''
 }
+function loanMethodLabel(v) {
+  return v === 'EQUAL_PAYMENT' ? '원리금균등' : v === 'EQUAL_PRINCIPAL' ? '원금균등' : v === 'BULLET' ? '만기일시' : ''
+}
 
 onMounted(async () => {
   await load()
@@ -362,6 +387,10 @@ onBeforeUnmount(() => sortable?.destroy())
                 >{{ revealedAccts.has(w.id) ? '🙈' : '👁' }}</button>
               </template>
               <template v-if="w.type === 'INVEST'"> · 투자금 {{ won(w.investedAmount) }}</template>
+              <template v-if="w.type === 'LOAN'">
+                <span v-if="w.loanAmount"> · 실행 {{ won(w.loanAmount) }}원</span>
+                <span v-if="w.loanRate"> · {{ w.loanRate }}%<span v-if="w.loanMethod"> / {{ loanMethodLabel(w.loanMethod) }}</span></span>
+              </template>
             </span>
           </div>
           <div class="balance-wrap">
@@ -458,6 +487,33 @@ onBeforeUnmount(() => sortable?.destroy())
               </template>
               <label>기준일<input v-model="form.openingDate" type="date" :disabled="submitting" /></label>
 
+              <!-- 대출 전용 -->
+              <template v-if="form.type === 'LOAN'">
+                <label>대출 실행 금액(원금)
+                  <input v-model.number="form.loanAmount" type="number" min="0"
+                    placeholder="처음 빌린 금액 (예: 10000000)" :disabled="submitting" />
+                </label>
+                <label>연이자율(%)
+                  <input v-model.number="form.loanRate" type="number" min="0" max="100" step="0.01"
+                    placeholder="예: 5.25" :disabled="submitting" />
+                </label>
+                <label>상환방식
+                  <select v-model="form.loanMethod" :disabled="submitting">
+                    <option value="">(선택 안 함)</option>
+                    <option value="EQUAL_PAYMENT">원리금균등상환</option>
+                    <option value="EQUAL_PRINCIPAL">원금균등상환</option>
+                    <option value="BULLET">만기일시상환</option>
+                  </select>
+                </label>
+                <label>대출기간(개월)
+                  <input v-model.number="form.loanMonths" type="number" min="1"
+                    placeholder="예: 120 (10년)" :disabled="submitting" />
+                </label>
+                <label>대출시작일
+                  <input v-model="form.loanStart" type="date" :disabled="submitting" />
+                </label>
+              </template>
+
               <p v-if="formError" class="msg error">{{ formError }}</p>
 
               <div class="buttons">