refactor(admin): 合并管理后台并移除 apps/agent

- 平台与代理共用 apps/admin，统一登录 manage/auth/login
- 按 userType 展示菜单，修复 token 循环跳转
- 删除独立 apps/agent 前端工程

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

apps/admin/src/views/agent/Bets.vue

@@ -0,0 +1,25 @@
+<script setup lang="ts">
+import { ref, onMounted } from 'vue';
+import api from '../../api';
+
+const bets = ref<unknown[]>([]);
+
+onMounted(async () => {
+  const { data } = await api.get('/agent/bets');
+  bets.value = data.data.items;
+});
+</script>
+
+<template>
+  <h2>下级注单</h2>
+  <el-table :data="bets">
+    <el-table-column prop="betNo" label="注单号" />
+    <el-table-column label="玩家">
+      <template #default="{ row }">
+        {{ (row as { user?: { username: string } }).user?.username }}
+      </template>
+    </el-table-column>
+    <el-table-column prop="stake" label="投注额" />
+    <el-table-column prop="status" label="状态" />
+  </el-table>
+</template>