fix(cli): print the skill hint from PowerShell installers only when difyctl is on PATH

cli/scripts/install-r2.ps1

@@ -59,7 +59,9 @@ function Install-DifyctlBinary([string]$dlUrl, [string]$sha, [string]$version, [
     Write-Host "$installDir is not on your PATH. Add it with:"
     Write-Host "  [Environment]::SetEnvironmentVariable('PATH', `"$installDir;`$env:PATH`", 'User')"
   }
-  Write-SkillHint
+  else {
+    Write-SkillHint
+  }
 }
 
 function Install-DifyctlR2 {

cli/scripts/install.ps1

@@ -161,8 +161,8 @@ function Invoke-Main {
         }
         else {
             Write-Host 'verify: run "difyctl version"'
+            Write-SkillHint
         }
-        Write-SkillHint
     }
     finally {
         Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue