新增 pc-client：畅联 PC 端工程（Electron+React，按确认效果图改造，B-59）

- 基于 openim-electron-demo 改造：工号+密码登录（自研账号服务）、会话列表/聊天窗/通讯录界面重做
- 文字/语音/文件/图片消息、文件拖拽发送、表情面板、一对一语音通话（LiveKit）
- RTC 令牌对接账号服务带鉴权版 /api/rtc_token（Bearer imToken + {room,identity}）
- account-service: CORS Allow-Headers 补 authorization（浏览器/渲染进程跨域调 rtc_token 需要）
- 附本地 mock 账号服务（scripts/mock-account-server.js）与截图联调脚本

pc-client/src/routes/ContactRoutes.ts

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+const contactRoutes = [
+  {
+    path: "groupNotifications",
+    async lazy() {
+      const { GroupNotifications } = await import("@/pages/contact/groupNotifications");
+      return { Component: GroupNotifications };
+    },
+  },
+  {
+    index: true,
+    async lazy() {
+      const { MyFriends } = await import("@/pages/contact/myFriends");
+      return { Component: MyFriends };
+    },
+  },
+  {
+    path: "myGroups",
+    async lazy() {
+      const { MyGroups } = await import("@/pages/contact/myGroups");
+      return { Component: MyGroups };
+    },
+  },
+  {
+    path: "newFriends",
+    async lazy() {
+      const { NewFriends } = await import("@/pages/contact/newFriends");
+      return { Component: NewFriends };
+    },
+  },
+];
+
+export default contactRoutes;

pc-client/src/routes/GlobalErrorElement.tsx

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+import { Button, Result } from "antd";
+import { t } from "i18next";
+import { useRouteError } from "react-router-dom";
+
+const GlobalErrorElement = () => {
+  const error = useRouteError();
+
+  const reload = () => {
+    window.location.reload();
+  };
+
+  console.error("GlobalErrorElement");
+  console.error(error);
+
+  return (
+    <div className="flex h-full w-full items-center justify-center">
+      <Result
+        status="404"
+        subTitle={t("toast.somethingError")}
+        extra={
+          <Button type="primary" onClick={reload}>
+            {t("placeholder.recover")}
+          </Button>
+        }
+      />
+    </div>
+  );
+};
+
+export default GlobalErrorElement;

pc-client/src/routes/index.tsx

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+import { createHashRouter } from "react-router-dom";
+
+import { MainContentLayout } from "@/layout/MainContentLayout";
+import { MainContentWrap } from "@/layout/MainContentWrap";
+import { EmptyChat } from "@/pages/chat/EmptyChat";
+import { QueryChat } from "@/pages/chat/queryChat";
+
+import contactRoutes from "./ContactRoutes";
+import GlobalErrorElement from "./GlobalErrorElement";
+
+const router = createHashRouter([
+  {
+    path: "/",
+    element: <MainContentWrap />,
+    errorElement: <GlobalErrorElement />,
+    children: [
+      {
+        path: "/",
+        element: <MainContentLayout />,
+        children: [
+          {
+            path: "/chat",
+            async lazy() {
+              const { Chat } = await import("@/pages/chat");
+              return { Component: Chat };
+            },
+            children: [
+              {
+                index: true,
+                element: <EmptyChat />,
+              },
+              {
+                path: ":conversationID",
+                element: <QueryChat />,
+              },
+            ],
+          },
+          {
+            path: "contact",
+            async lazy() {
+              const { Contact } = await import("@/pages/contact");
+              return { Component: Contact };
+            },
+            children: contactRoutes,
+          },
+        ],
+      },
+      {
+        path: "login",
+        async lazy() {
+          const { Login } = await import("@/pages/login");
+          return { Component: Login };
+        },
+      },
+    ],
+  },
+]);
+
+export default router;