refactor(admin): 管理后台 UI - 独立设计系统并与用户端隔离

把后台 token、Ant 主题、壳层控件和抽屉弹窗从用户工作台拆开，去掉树状侧栏装饰线，色板仍用原来的中性黑白台阶。

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

web/src/pages/admin/settings/response-interception-settings-page.tsx

@@ -1,5 +1,5 @@
 import { App, Button, Input, Skeleton } from "antd";
-import { Switch } from "@/components/ui/base/switch";
+import { Switch } from "@/pages/admin/ui/controls";
 import { AlertTriangle, ArrowDown, ArrowUp, BadgeCheck, Eye, ListOrdered, Plus, RefreshCw, RotateCcw, Save, Search, ShieldAlert, ShieldCheck, Trash2 } from "lucide-react";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useBlocker } from "react-router";