feat(client): 开机自启拉起直接最小化到托盘(--autostart 标志)(1.0.28)

计划任务 /tr 命令带 --autostart;main() 检测到该参数在首帧前 windowManager.hide()
隐藏主窗口到托盘,自动连接逻辑照常跑。手动打开(无参数)仍正常显示窗口。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/windows/installer/pangolin.iss

@@ -3,7 +3,7 @@
 ; 前置: 先在 client/ 跑 `flutter build windows`(Release),产物在
 ;       ..\..\build\windows\x64\runner\Release
 #define MyAppName "穿山甲 Pangolin"
-#define MyAppVersion "1.0.27"
+#define MyAppVersion "1.0.28"
 #define MyAppPublisher "Pangolin"
 #define MyAppExeName "pangolin_vpn.exe"
 #define BuildDir "..\..\build\windows\x64\runner\Release"