helm: Separate image registry from repository in values.yaml

[Defilan]

Summary

Currently the Helm chart combines the registry and repository into a single field:

image:
  repository: ghcr.io/defilantech/llmkube-controller

Proposed Change

Split into separate fields:

image:
  registry: ghcr.io
  repository: defilantech/llmkube-controller

Benefits

• Makes it easier to mirror images to other registries (ECR, GCR, private registries)
• No string manipulation needed when changing registries
• Follows pattern used by many popular Helm charts (bitnami, etc.)

Implementation

1. Update values.yaml to add image.registry field
2. Update _helpers.tpl to construct full image reference from registry + repository
3. Update documentation

Labels

enhancement, helm