docs: update README for tkinter UI

Author: zocs

README.md

@@ -16,6 +16,7 @@ ESP32-C3 墨水屏阅读器备份与刷机工具 | E-Ink Reader Backup & Flash T
 - ⚡ 固件刷入（完整写入 / OTA 更新 / 恢复原厂），带风险确认
 - 📋 实时日志，进度条显示
 - 🎨 现代浅色主题
+- 🌐 中英文双语界面，一键切换
 
 ## 使用
 
@@ -66,7 +67,7 @@ X3 和 X4 刷 CrossPoint 使用**相同的分区布局**，esptool 命令完全
 ## 从源码构建
 
 ```powershell
-pip install pyqt5 pyserial esptool
+pip install pyserial esptool
 python main.py
 ```
 
@@ -106,6 +107,7 @@ Supported devices: xteink X3, X4
 - Firmware flash (full write / OTA update / restore) with risk confirmation
 - Real-time log with progress bar
 - Modern light theme
+- Bilingual UI (Chinese / English) with one-click toggle
 
 ### Usage
 
@@ -124,7 +126,7 @@ Official firmware is a full 16MB image (includes bootloader + partition table +
 ### Build from source
 
 ```powershell
-pip install pyqt5 pyserial esptool
+pip install pyserial esptool
 python main.py
 ```