refactor(admin): drop the SPA credits asset record browser

「用户近期资产记录」卡片在 SPA 积分配置页里按用户 ID + 资产类型 +
日期查 user meta 历史，再伪装成统一账本行（entries / operation_key /
ref_key）。SPA 只承载配置，运营记录归原生 用户 → 积分/余额 屏幕
（CreditsAdmin / BalanceAdmin），这条平行路径删除，不留双读或迁移。

- CmsCredits.vue: 移除卡片、表格、分页及 ledger* 状态与
  formatAssetValue/loadLedger/searchLedger/resetLedger
- users.js: 删除仅服务该卡片的 getCreditLog()
- UserController: 删除 /assets/transactions 路由、rest_get_credits_log()
  及其唯一调用方 asset_value_to_minor()
- 契约测试改为断言该能力不得回归

points_record / balance_record 本身保留，前端账本与原生后台仍在消费。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/admin/src/api/modules/users.js

@@ -27,8 +27,4 @@ export const usersApiMethods = {
 	adjustUserCredits(id, asset, delta, remark) {
 		return this.request(`/assets/accounts/${id}/adjust`, { method: 'POST', body: JSON.stringify({ asset, delta, remark }) })
   },
-  getCreditLog(params = {}) {
-    const qs = new URLSearchParams(params).toString()
-		return this.request('/assets/transactions' + (qs ? `?${qs}` : ''))
-  },
 }

assets/admin/src/pages/CmsCredits.vue

@@ -23,33 +23,6 @@
       </n-form>
     </n-card>
 
-    <n-card title="用户近期资产记录" class="aksrt-section-card">
-      <n-space vertical :size="12">
-        <n-space wrap>
-          <n-input v-model:value="ledgerFilters.user_id" placeholder="用户 ID" clearable style="width: 130px" />
-          <n-select v-model:value="ledgerFilters.asset" :options="assetOptions" placeholder="资产" style="width: 130px" />
-          <n-input v-model:value="ledgerFilters.date_from" type="date" placeholder="开始日期" style="width: 160px" />
-          <n-input v-model:value="ledgerFilters.date_to" type="date" placeholder="结束日期" style="width: 160px" />
-          <n-button type="primary" :loading="ledgerLoading" @click="searchLedger">查询</n-button>
-          <n-button @click="resetLedger">重置</n-button>
-        </n-space>
-        <n-data-table
-          :columns="ledgerColumns"
-          :data="ledgerRows"
-          :loading="ledgerLoading"
-          :row-key="row => row.id"
-          :scroll-x="1100"
-          size="small"
-        />
-        <n-pagination
-          v-model:page="ledgerPage"
-          :page-count="ledgerPageCount"
-          :page-size="10"
-          @update:page="loadLedger"
-        />
-      </n-space>
-    </n-card>
-
     <n-card class="aksrt-section-card">
       <div class="aksrt-section-header"><h3>每日签到</h3></div>
       <n-form :model="cfg.daily_signin" label-placement="left" label-width="200" class="aksrt-form">
@@ -162,79 +135,6 @@ const cfg = reactive({
 })
 const streakJson = ref('{}')
 const saving = ref(false)
-const ledgerLoading = ref(false)
-const ledgerRows = ref([])
-const ledgerPage = ref(1)
-const ledgerPageCount = ref(1)
-const ledgerFilters = reactive({
-  user_id: '',
-  asset: 'points',
-  date_from: '',
-  date_to: '',
-})
-const assetOptions = [
-  { label: '积分', value: 'points' },
-  { label: '余额', value: 'balance' },
-]
-const ledgerColumns = [
-  { title: '类型', key: 'reason', width: 150 },
-  { title: '订单号', key: 'ref_key', width: 200 },
-  { title: '变动 / 变动后', key: 'delta_label', width: 190 },
-  { title: '说明', key: 'remark', width: 240, ellipsis: { tooltip: true } },
-  { title: '时间', key: 'created_at', width: 170 },
-]
-
-function formatAssetValue(asset, value) {
-  const raw = Number(value ?? 0)
-  if (!Number.isFinite(raw)) return asset === 'balance' ? '0.00' : '0'
-  if (asset !== 'balance') return String(raw)
-  const negative = raw < 0
-  const digits = String(Math.abs(Math.trunc(raw))).padStart(3, '0')
-  const whole = digits.slice(0, -2).replace(/^0+(?=\d)/, '')
-  return (negative ? '-' : '') + whole + '.' + digits.slice(-2)
-}
-
-async function loadLedger() {
-  ledgerLoading.value = true
-  try {
-    if (!/^\d+$/.test(String(ledgerFilters.user_id).trim())) {
-      message.warning('请输入用户 ID 后查询该用户近期记录')
-      return
-    }
-    const params = { page: ledgerPage.value, per_page: 10 }
-    Object.entries(ledgerFilters).forEach(([key, value]) => {
-      if (value !== null && String(value).trim() !== '') params[key] = value
-    })
-    const response = await api.getCreditLog(params)
-    const data = response?.data || response || {}
-    ledgerRows.value = (data.items || []).map((row) => {
-      const entries = Array.isArray(row.entries) ? row.entries : []
-      const entry = entries[0] || {}
-      return {
-        ...row,
-        delta_label: `${formatAssetValue(entry.asset, entry.delta)} / ${formatAssetValue(entry.asset, entry.balance_after)}`,
-        remark: row.remark || '—',
-      }
-    })
-    ledgerPageCount.value = Math.max(1, Math.ceil(Number(data.total || 0) / Number(data.per_page || 10)))
-  } catch (e) {
-    message.error(e.message || '加载资产记录失败')
-  } finally {
-    ledgerLoading.value = false
-  }
-}
-
-function searchLedger() {
-  ledgerPage.value = 1
-  loadLedger()
-}
-
-function resetLedger() {
-  Object.assign(ledgerFilters, { user_id: '', asset: 'points', date_from: '', date_to: '' })
-  ledgerRows.value = []
-  ledgerPage.value = 1
-  ledgerPageCount.value = 1
-}
 
 async function loadCfg() {
   try {