浏览器兑换独立成页面并按斗鱼模式优化导入

新增 /huya/browser-exchange 页面（精英宝典下方），支持导入账号与
执行兑换，客服仅见已分配账号；账号管理页移除该功能。导入弹窗对齐
斗鱼操作台：服务端分页筛选、可搜索标签、无 CK 不展示、导入本页/
一键导入全部/导入选中；新增 /accounts/ids 接口与 workbench
browser_exchange scope。

tests/test_huya_workbench_scopes.py

@@ -6,6 +6,7 @@ from web.backend.database import Base
 from web.backend.models import HuyaAccount, HuyaWorkbench, HuyaWorkbenchAccount, User
 from web.backend.routers.huya import (
     delete_account,
+    list_huya_account_ids,
     list_huya_workbench_accounts,
     list_tasks,
     update_huya_workbench_accounts,
@@ -70,6 +71,37 @@ class TestHuyaWorkbenchScope:
                 handbook_scope="invalid",
             )
 
+    def test_browser_exchange_scope_and_account_ids(self):
+        no_cookie = HuyaAccount(uid="200", yyuid="200", cookie="")
+        self.session.add(no_cookie)
+        self.session.commit()
+
+        update_huya_workbench_accounts(
+            HuyaWorkbenchAccountsUpdate(handbook_scope="browser_exchange", account_ids=[self.account.id]),
+            db=self.session,
+            current=self.user,
+        )
+        assert list_huya_workbench_accounts("browser_exchange", db=self.session, current=self.user) == {
+            "account_ids": [self.account.id],
+            "configured": True,
+        }
+        # browser_exchange 与 elite 两个 scope 的账号集合互不影响
+        assert list_huya_workbench_accounts("elite", db=self.session, current=self.user) == {
+            "account_ids": [],
+            "configured": False,
+        }
+
+        # ids 接口：has_cookie=True 只返回有 Cookie 的账号
+        result = list_huya_account_ids(has_cookie=True, db=self.session, current=self.user)
+        assert result == {"account_ids": [self.account.id], "total": 1}
+        all_ids = list_huya_account_ids(db=self.session, current=self.user)
+        assert sorted(all_ids["account_ids"]) == sorted([self.account.id, no_cookie.id])
+        assert all_ids["total"] == 2
+
+        # ids 接口：search 匹配 uid
+        searched = list_huya_account_ids(search="200", db=self.session, current=self.user)
+        assert searched["account_ids"] == [no_cookie.id]
+
     def test_account_delete_cleans_workbench_membership(self):
         self.session.add(
             HuyaWorkbenchAccount(