Fix: remove duplicate /templates prefix in helm checksum paths

[Matroxt]

Problem

When running helm template, you'd get this error

Error: Error: template: templates/langflow/deployment.yaml:23:28: executing "templates/langflow/deployment.yaml"  
  at <include (print $.Template.BasePath "/templates/langflow/langflow-dotenv.yaml") .>: error calling include: template: no        
  template "templates/templates/langflow/langflow-dotenv.yaml" associated with template "gotpl"

Reason

The $.Template.BasePath variable already resolves to the templates/ directory, so including /templates/ in the path caused an incorrect checksum annotations for the backend and langflow deployments.

Fix

This fix removes the redundant prefix so Helm can correctly locate and hash the dotenv files, ensuring pods are restarted when their configuration changes.

Also

• Bumps the chart version to 0.2.1 because of the fix
• Adjust appVersion to 0.4.1 to reflect the current release.