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/player/src/layouts/MainLayout.vue

@@ -10,6 +10,7 @@ import LocaleSwitcher from '../components/LocaleSwitcher.vue';
 import { useAppLocale } from '../composables/useAppLocale';
 import AnnouncementMarquee from '../components/AnnouncementMarquee.vue';
 import BottomNavIcon from '../components/BottomNavIcon.vue';
+import CustomerServiceModal from '../components/CustomerServiceModal.vue';
 import { computed, onMounted, ref, watch } from 'vue';
 import { usePlayerHome } from '../composables/usePlayerHome';
 import { usePlayerProfile } from '../composables/usePlayerProfile';
@@ -44,6 +45,7 @@ const { announcements, load: loadPlayerHome } = usePlayerHome();
 const { loadProfile } = usePlayerProfile();
 const mainRef = ref<HTMLElement | null>(null);
 const tabScrollTops = new Map<string, number>();
+const customerServiceOpen = ref(false);
 
 watch(locale, (next, prev) => {
   if (prev && next !== prev) void loadPlayerHome(true);
@@ -66,8 +68,10 @@ onMounted(() => {
 watch(
   () => auth.token,
   (token) => {
+    // 首页数据（公告、热门赛事）对所有人公开，始终加载
+    void loadPlayerHome();
+    // 个人资料仅登录用户需要
     if (token) {
-      void loadPlayerHome();
       void loadProfile();
     }
   },
@@ -80,9 +84,34 @@ watch(
     <header v-if="showHeader" class="header">
       <img src="/logo.png" alt="TheBet365" class="logo" />
       <div class="header-actions">
+        <button
+          type="button"
+          class="support-btn"
+          :aria-label="t('support.open')"
+          @click="customerServiceOpen = true"
+        >
+          <svg class="support-icon" viewBox="0 0 24 24" aria-hidden="true">
+            <path
+              d="M12 3C7.03 3 3 6.58 3 11c0 2.02.9 3.86 2.38 5.24L4 21l4.2-1.02A10.8 10.8 0 0 0 12 19c4.97 0 9-3.58 9-8s-4.03-8-9-8Z"
+              fill="none"
+              stroke="currentColor"
+              stroke-width="1.8"
+              stroke-linejoin="round"
+            />
+            <circle cx="9" cy="11" r="1" fill="currentColor" />
+            <circle cx="12" cy="11" r="1" fill="currentColor" />
+            <circle cx="15" cy="11" r="1" fill="currentColor" />
+          </svg>
+          <span class="support-label">{{ t('support.short') }}</span>
+        </button>
         <LocaleSwitcher />
-        <CashBalanceChip v-if="auth.user" />
-        <UserAvatarMenu v-if="auth.user" />
+        <template v-if="auth.user">
+          <CashBalanceChip />
+          <UserAvatarMenu />
+        </template>
+        <button v-else type="button" class="login-btn" @click="auth.showLoginPrompt(route.fullPath)">
+          {{ t('auth.login') }}
+        </button>
       </div>
     </header>
 
@@ -127,6 +156,7 @@ watch(
     </nav>
 
     <BetSlipDrawer v-model="slip.drawerOpen" />
+    <CustomerServiceModal v-model="customerServiceOpen" />
   </div>
 </template>
 
@@ -168,6 +198,55 @@ watch(
 .header-actions :deep(.avatar-btn) {
   width: var(--header-chip-h);
 }
+
+.support-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  height: var(--header-chip-h, 36px);
+  padding: 0 10px;
+  border-radius: 6px;
+  border: 1px solid var(--border-gold-soft, rgba(200, 168, 78, 0.25));
+  background: rgba(200, 168, 78, 0.08);
+  color: var(--primary-light, #c8a84e);
+  font-size: 12px;
+  font-weight: 700;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+
+.support-btn:active {
+  background: rgba(200, 168, 78, 0.16);
+}
+
+.support-icon {
+  width: 18px;
+  height: 18px;
+  flex-shrink: 0;
+}
+
+.support-label {
+  max-width: 48px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.login-btn {
+  padding: 6px 16px;
+  border-radius: 6px;
+  border: 1px solid var(--primary, #c8a84e);
+  background: transparent;
+  color: var(--primary-light, #c8a84e);
+  font-size: 13px;
+  font-weight: 700;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.login-btn:active {
+  background: rgba(200, 168, 78, 0.15);
+}
 .announce-strip {
   flex-shrink: 0;
   z-index: 105;