chore(client): 1.0.19 — 自动连接诊断日志

排查「自动连接没生效」:在 _RootFlow 自动连接路径(HomeShell 显示 / 节点就绪 / autoConnect/phase 判定 / 触发)
与 Settings(_load 读到的 autoConnect、setAutoConnect 落盘)加 logLine 日志,定位卡在哪一步。诊断完移除。

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 "1.0.18"
+#define MyAppVersion "1.0.19"
 #define MyAppPublisher "Pangolin"
 #define MyAppExeName "pangolin_vpn.exe"
 #define BuildDir "..\..\build\windows\x64\runner\Release"