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/api/src/domains/operations/cashback/cashback.service.ts

@@ -18,6 +18,7 @@ type AggregatedItem = {
   amount: Decimal;
   username: string;
   agentUsername: string | null;
+  availableBalance: Decimal;
 };
 
 type BetCashbackLine = {
@@ -158,12 +159,25 @@ export class CashbackService {
         : [];
     const userById = new Map(users.map((u) => [u.id.toString(), u]));
 
+    const wallets =
+      userIds.length > 0
+        ? await this.prisma.wallet.findMany({
+            where: { userId: { in: userIds } },
+            select: { userId: true, availableBalance: true },
+          })
+        : [];
+    const balanceByUserId = new Map(
+      wallets.map((w) => [w.userId.toString(), w.availableBalance]),
+    );
+
     const items: AggregatedItem[] = rawItems.map((item) => {
       const user = userById.get(item.userId.toString());
       return {
         ...item,
         username: user?.username ?? '',
         agentUsername: user?.parent?.username ?? null,
+        availableBalance:
+          balanceByUserId.get(item.userId.toString()) ?? new Decimal(0),
       };
     });
 
@@ -362,6 +376,17 @@ export class CashbackService {
         : [];
     const userById = new Map(users.map((u) => [u.id.toString(), u]));
 
+    const wallets =
+      userIds.length > 0
+        ? await this.prisma.wallet.findMany({
+            where: { userId: { in: userIds } },
+            select: { userId: true, availableBalance: true },
+          })
+        : [];
+    const balanceByUserId = new Map(
+      wallets.map((w) => [w.userId.toString(), w.availableBalance]),
+    );
+
     let operatorUsername: string | null = null;
     if (batch.operatorId) {
       const op = await this.prisma.user.findUnique({
@@ -378,6 +403,8 @@ export class CashbackService {
         userId: item.userId,
         username: user?.username ?? '',
         agentUsername: user?.parent?.username ?? null,
+        availableBalance:
+          balanceByUserId.get(item.userId.toString()) ?? new Decimal(0),
         effectiveStake: item.effectiveStake,
         betCount: item.betCount,
         rate: item.rate,
@@ -448,6 +475,13 @@ export class CashbackService {
       }
     }
 
+    if (betIds.length > 0) {
+      await this.prisma.bet.updateMany({
+        where: { id: { in: betIds } },
+        data: { isCashbacked: true },
+      });
+    }
+
     await this.prisma.cashbackBatch.update({
       where: { id: batchId },
       data: { status: 'CONFIRMED', confirmedAt: new Date(), operatorId },