feat: 手动充值、邀请码注册与后台管理增强

新增玩家手动充值全流程（收款方式配置、充值下单/审核、钱包上分），
支持邀请码注册、邀请历史与专属返水率；完善后台代理/玩家管理与响应式操作栏，
并补充前台注册、充值页及多语言错误码。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/admin/src/views/Cashback.vue

@@ -4,6 +4,7 @@ import type { TableColumnCtx } from 'element-plus';
 import { ElMessage, ElMessageBox } from 'element-plus';
 import { useAdminLocale } from '../composables/useAdminLocale';
 import { formatAmount, formatAmountFull } from '../utils/format-amount';
+import { formatRatePercent } from '../utils/rate-percent';
 import AdminTableEmpty from '../components/AdminTableEmpty.vue';
 import { resolveApiError } from '../i18n/form-validation';
 import api from '../api';
@@ -69,9 +70,7 @@ const previewItems = computed(() => preview.value?.items ?? []);
 const detailItems = computed(() => detail.value?.items ?? []);
 
 function formatRate(value: string | number | null | undefined) {
-  const n = Number(value);
-  if (!Number.isFinite(n)) return '—';
-  return `${(n * 100).toFixed(2)}%`;
+  return formatRatePercent(value);
 }
 
 function formatPeriodDate(value: string) {
@@ -613,9 +612,9 @@ onMounted(loadHistory);
 }
 
 .rules-help-btn:hover {
-  color: var(--green-glow);
-  border-color: rgba(47, 181, 106, 0.45);
-  background: rgba(47, 181, 106, 0.08);
+  color: #f5f5f5;
+  border-color: rgba(255, 255, 255, 0.14);
+  background: rgba(255, 255, 255, 0.04);
 }
 
 .rules-list {
@@ -708,7 +707,7 @@ onMounted(loadHistory);
 
 .pstat-green {
   color: var(--green-glow);
-  text-shadow: 0 0 20px rgba(47, 181, 106, 0.35);
+  text-shadow: none;
 }
 
 .pstat-label {