fix: complete admin input hints

src/modules/finance/pages/FinanceCustomerAccountsView.vue

@@ -282,7 +282,7 @@ watch(() => [route.name, String(route.params.customerId || '')], ([name, custome
             <QueryToolbar v-model="ledgerFilters" class="ledger-query" :fields="ledgerQueryFields" ariaLabel="账户流水筛选" preference-key="finance-account-ledger-query" @search="ledgerPage = 1; void loadLedger($event)" />
             <div class="detail-table-scroll"><DataTable v-model:page="ledgerPage" v-model:page-size="ledgerPageSize" class="ledger-table" :data="ledger" :columns="ledgerColumns" :loading="ledgerLoading" :total="ledgerTotal" row-key="ledgerId" empty-text="暂无账户流水" @update:page="loadLedger()" @update:page-size="ledgerPage = 1; loadLedger()"><template #toolbar-actions><el-button v-if="canExport" :loading="ledgerExportBusy" :disabled="ledgerLoading || ledgerExportBusy" @click="exportLedger"><Download :size="16" />导出流水</el-button></template><template #pagination-left>共 {{ ledgerTotal }} 条</template><template #ledgerId="{ row }"><span class="ledger-identifier" :title="displayLedgerId(row.ledgerId)">{{ displayLedgerId(row.ledgerId) }}</span></template><template #occurredAt="{ row }">{{ formatDateTime(row.occurredAt) }}</template><template #businessType="{ row }">{{ ledgerBusinessType(row.businessType) }}</template><template #documentNo="{ row }"><span class="ledger-document" :title="displayDocumentNo(row.documentNo)">{{ displayDocumentNo(row.documentNo) }}</span></template><template #operatorName="{ row }">{{ displayOperator(row.operatorName) }}</template></DataTable></div>
           </FormSection>
-          <FormSection v-else class="term-section" title="账期设置" :bordered="false"><div class="term-editor"><span class="term-label">账期天数</span><div class="term-control"><el-input-number v-model="creditDays" :min="0" :max="3650" :step="1" /><span class="term-unit">天</span></div></div></FormSection>
+          <FormSection v-else class="term-section" title="账期设置" :bordered="false"><div class="term-editor"><span class="term-label">账期天数</span><div class="term-control"><el-input-number v-model="creditDays" :min="0" :max="3650" :step="1" placeholder="请输入账期天数" /><span class="term-unit">天</span></div></div></FormSection>
         </template>
         <template v-if="editing && selected && !ledgerError" #footer><div class="detail-footer"><el-button @click="closeDetail">关闭</el-button><el-button v-if="canUpdateTerms" type="primary" :loading="saving" @click="saveTerms"><Save :size="16" />保存账期</el-button></div></template>
       </DetailPageLayout>