fix(remote): 补 ReadVncServerConfig 漏读的 LogLevel(读/写/结构体三处均达 37 项全集)+VncPasswordDecrypt 短于 8 字节直接返回空串(底层 DES 按前 8 字节切片, 短输入必 panic); 新增字段数锁定与短密文防护单测

remote/vnc.go

@@ -40,6 +40,7 @@ func ReadVncServerConfig() (VncServerConfig, error) {
 	config.RepeatControlAuthentication, _, _ = GetDwordValue(key, "RepeatControlAuthentication")
 	config.LoopbackOnly, _, _ = GetDwordValue(key, "LoopbackOnly")
 	config.AcceptHttpConnections, _, _ = GetDwordValue(key, "AcceptHttpConnections")
+	config.LogLevel, _, _ = GetDwordValue(key, "LogLevel")
 	config.EnableFileTransfers, _, _ = GetDwordValue(key, "EnableFileTransfers")
 	config.RemoveWallpaper, _, _ = GetDwordValue(key, "RemoveWallpaper")
 	config.UseD3D, _, _ = GetDwordValue(key, "UseD3D")
@@ -177,7 +178,11 @@ func VncPasswordCrypt(password string) []byte {
 	return vncpasswd.Crypt(password)
 }
 
-// VncPasswordDecrypt 解密 VNC 密码
+// VncPasswordDecrypt 解密 VNC 密码。密文恒为 8 字节(标准 VNC DES)，
+// 不足 8 字节(缺失/截断)直接返回空串——底层 DES 解密会按前 8 字节切片，短输入必 panic。
 func VncPasswordDecrypt(data []byte) string {
+	if len(data) < 8 {
+		return ""
+	}
 	return vncpasswd.Decrypt(data)
 }