[Bug]: Built-in catalog templates cannot be loaded on Windows

[BittuBarnwal7479]

📝 Description

The built-in template renderer cannot load Helm or Terraform catalog templates on Windows.

The template roots are constructed with filepath.Join, which produces backslash-separated paths (\) on Windows. These paths are then passed to embed.FS, but Go's io/fs APIs always expect forward-slash (/) separated paths. As a result, the embedded template directories cannot be found.

🧪 Steps to Reproduce

1. Clone the repository on Windows.

2. Change to the src directory.

3. Run:

   go test ./internal/render
   

💻 Environment

Kubara branch: main
Go version: go1.26.4 windows/amd64
OS: Windows

📎 Additional Context / Logs

✅ Checklist

• I have searched existing issues
• I am using the latest version of Kubara
• The issue is reproducible
• This is not a duplicate

[tuunit]

@BittuBarnwal7479 thanks for the report and PR. We will be looking into it this week :)