feat: 前台匿名浏览、登录引导、客服入口与返水增强

前台：
- 未登录可浏览首页/赛事/赔率，下注等操作弹出登录引导（去登录/继续浏览）
- 顶部新增客服入口与 iframe 弹窗
- 登录页支持暂不登录返回浏览

API：
- 首页/赛事/冠军盘接口改为公开访问，支持 X-Locale 头
- JWT 守卫支持可选认证

返水：
- 注单新增 is_cashbacked 字段，发放时自动标记
- 预览展示玩家余额，明确平台直发不从代理扣款
- 后台注单列表与玩家历史展示回水状态

其他：
- 串关禁止同场重复选号（SAME_MATCH）
- 补充结算资金流分析文档

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

apps/admin/src/views/Bets.vue

@@ -229,6 +229,12 @@ async function openDetail(row: BetListRow) {
           </el-tag>
         </template>
       </el-table-column>
+      <el-table-column :label="t('bet.col.cashbacked')" width="88" align="center">
+        <template #default="{ row }">
+          <el-tag v-if="row.isCashbacked" type="success" size="small" effect="plain">✓</el-tag>
+          <span v-else class="bet-content-empty">—</span>
+        </template>
+      </el-table-column>
       <el-table-column :label="t('bet.col.placed_at')" min-width="168">
         <template #default="{ row }">{{ formatTime(row.placedAt) }}</template>
       </el-table-column>
@@ -284,6 +290,9 @@ async function openDetail(row: BetListRow) {
           </el-descriptions-item>
           <el-descriptions-item :label="t('bet.col.placed_at')">{{ formatTime(detail.placedAt) }}</el-descriptions-item>
           <el-descriptions-item :label="t('bet.field.settled_at')">{{ formatTime(detail.settledAt) }}</el-descriptions-item>
+          <el-descriptions-item :label="t('bet.col.cashbacked')">
+            {{ detail.isCashbacked ? t('common.yes') : t('common.no') }}
+          </el-descriptions-item>
           <el-descriptions-item :label="t('bet.field.request_id')" :span="2">{{ detail.requestId }}</el-descriptions-item>
         </el-descriptions>
 

apps/admin/src/views/Cashback.vue

@@ -27,6 +27,7 @@ interface CashbackPreviewItem {
   userId: string;
   username: string;
   agentUsername: string | null;
+  availableBalance: string;
   effectiveStake: string;
   betCount: number;
   rate: string;
@@ -288,6 +289,7 @@ onMounted(loadHistory);
         <li>{{ t('cashback.rule_formula') }}</li>
         <li>{{ t('cashback.rule_rate') }}</li>
         <li>{{ t('cashback.rule_flow') }}</li>
+        <li>{{ t('cashback.rule_platform') }}</li>
         <li class="rules-note">{{ t('cashback.rule_note_zero') }}</li>
       </ul>
     </el-dialog>
@@ -374,6 +376,18 @@ onMounted(loadHistory);
             >
               <template #default="{ row }">{{ row.agentUsername || '—' }}</template>
             </el-table-column>
+            <el-table-column
+              prop="availableBalance"
+              :label="t('cashback.col.balance')"
+              min-width="110"
+              align="right"
+            >
+              <template #default="{ row }">
+                <el-tooltip :content="formatAmountFull(row.availableBalance)" placement="top">
+                  <span>{{ formatAmount(row.availableBalance) }}</span>
+                </el-tooltip>
+              </template>
+            </el-table-column>
             <el-table-column
               prop="betCount"
               :label="t('cashback.col.bet_count')"
@@ -547,6 +561,9 @@ onMounted(loadHistory);
               <el-table-column prop="agentUsername" :label="t('cashback.col.agent')" min-width="100">
                 <template #default="{ row }">{{ row.agentUsername || '—' }}</template>
               </el-table-column>
+              <el-table-column prop="availableBalance" :label="t('cashback.col.balance')" min-width="100" align="right">
+                <template #default="{ row }">{{ formatAmount(row.availableBalance) }}</template>
+              </el-table-column>
               <el-table-column prop="betCount" :label="t('cashback.col.bet_count')" width="88" align="right" />
               <el-table-column prop="effectiveStake" :label="t('cashback.col.effective_stake')" min-width="110" align="right">
                 <template #default="{ row }">{{ formatAmount(row.effectiveStake) }}</template>

apps/admin/src/views/bet-form.ts

@@ -25,6 +25,7 @@ export interface BetListRow {
   currency: string;
   placedAt: string;
   settledAt: string | null;
+  isCashbacked: boolean;
   selectionCount: number;
   selectionSummary: string;
   selectionPreviews: BetSelectionPreview[];