- Pass registration token from URL query parameter to install script generation
- Update RenderInstallScriptFromBuild to accept registration token
- Add RegistrationToken field to template data structure
This lays groundwork for fixing agent registration - install scripts will be able
to call the registration API with the provided token.
Created InstallTemplateService with clean template-based script generation.
Added linux.sh.tmpl and windows.ps1.tmpl for install scripts.
Removed massive generateLinuxScript and generateWindowsScript functions.
Downloads handler now uses template service (1073 lines → 174 lines).
Templates easily maintainable without modifying Go code.
