fix(client): 自动连接门控改判生效节点就绪 + _connect 诊断日志(1.0.23)

自动连接已正确触发,但 _connect 撞 node.uuid.isEmpty 报「节点尚未就绪」:门控用的是
nodes.any(uuid),而 _connect 用 effectiveNode。改门控直接判 effectiveNode.uuid 非空(与
_connect 同一判据)。_connect 加一行日志记录 node/uuid/selected/nodes 便于确认。

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 "1.0.22"
+#define MyAppVersion "1.0.23"
 #define MyAppPublisher "Pangolin"
 #define MyAppExeName "pangolin_vpn.exe"
 #define BuildDir "..\..\build\windows\x64\runner\Release"