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/electron/i18n/index.ts

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+import i18n from "i18next";
+
+import { getStore } from "../main/storeManage";
+import { app } from "electron";
+
+import translation_en from "./resources/en-US";
+import translation_zh from "./resources/zh-CN";
+
+const store = getStore();
+
+export const initI18n = () => {
+  const systemLanguage = app.getLocale();
+  const language = store.get("language", systemLanguage) as string;
+
+  const resources = {
+    "en-US": {
+      translation: translation_en,
+    },
+    "zh-CN": {
+      translation: translation_zh,
+    },
+    zh: {
+      translation: translation_zh,
+    },
+  };
+
+  i18n.init(
+    {
+      resources,
+      lng: language,
+      fallbackLng: "zh-CN",
+    },
+    (err) => {
+      if (err) return console.error("Error loading i18n resources:", err);
+      console.log("i18n resources loaded successfully");
+    },
+  );
+};
+
+export const changeLanguage = i18n.changeLanguage;

pc-client/electron/i18n/resources/en-US.ts

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+export default {
+  system: {
+    showWindow: "ShowWindow",
+    hideWindow: "HideWindow",
+    hide: "Hide",
+    about: "About",
+    quit: "Quit",
+    window: "Window",
+    toggleDevTools: "ToggleDevTools",
+    minimize: "Minimize",
+    close: "Close",
+    copy: "Copy",
+    paste: "Paste",
+    cut: "Cut",
+    undo: "Undo",
+    redo: "Redo",
+    selectAll: "SelectAll",
+    fastKeys: "FastKeys",
+    magnifier_position_label:"Position"
+  },
+};

pc-client/electron/i18n/resources/zh-CN.ts

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+export default {
+  system: {
+    showWindow: "显示",
+    hideWindow: "隐藏",
+    hide: "隐藏",
+    about: "关于",
+    quit: "退出",
+    window: "窗口",
+    toggleDevTools: "调试",
+    minimize: "最小化",
+    close: "关闭",
+    copy: "复制",
+    paste: "粘贴",
+    cut: "剪切",
+    undo: "撤销",
+    redo: "重做",
+    selectAll: "全选",
+    fastKeys: "快键键",
+    magnifier_position_label: "坐标",
+  },
+};