Add MinGW build config, remove console window, Chinese font support

sign.ps1

@@ -0,0 +1,14 @@
+$cert = New-SelfSignedCertificate -Type CodeSigningCert -Subject "CN=ProxmoxVMGUI" -CertStoreLocation Cert:\CurrentUser\My
+Write-Host "Certificate Thumbprint: $($cert.Thumbprint)"
+
+$pfxPath = "D:\selftools\proxmox-task\code_signing.pfx"
+
+$securePassword = New-Object -TypeName System.Security.SecureString
+$ptr = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($securePassword)
+$plainPassword = [System.Runtime.InteropServices.Marshal]::PtrToStringAuto($ptr)
+[System.Runtime.InteropServices.Marshal]::ZeroFreeBSTR($ptr)
+
+$pwd = ConvertTo-SecureString -String $plainPassword -AsPlainText -Force
+Export-PfxCertificate -Cert $cert -FilePath $pfxPath -Password $pwd
+
+Write-Host "Certificate exported to $pfxPath"