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/resources/en-US.ts

@@ -0,0 +1,21 @@
+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

@@ -0,0 +1,21 @@
+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",
+  },
+};