[servarr] add chownMedia toggle for init-directories (fix #71)

[amedranogil]

Kubito Helm Charts PR Checklist

• Chart Version: Updated version in Chart.yaml for the relevant chart.
• README Update: Updated from values.yaml metadata using readme-generator.
• Testing: Tested the chart locally, and it works as expected.

Changes Summary

Adds a new per-service persistence flag to control whether the init-directories container runs recursive chown on media folders:

• sonarr.persistence.chownMedia (default true)
• radarr.persistence.chownMedia (default true)
• lidarr.persistence.chownMedia (default true)

When set to false, init still creates directories but skips expensive recursive ownership changes, reducing startup delays on large NFS-backed media volumes. Default behavior remains unchanged for backward compatibility.

Also includes:

• Servarr chart patch version bump from 1.5.2 to 1.5.3
• Regenerated charts/servarr/README.md parameter table entries

Validation

• helm lint charts/servarr
• helm template servarr charts/servarr
• helm template servarr charts/servarr --set sonarr.persistence.chownMedia=false
• helm template servarr charts/servarr --set radarr.persistence.chownMedia=false
• helm template servarr charts/servarr --set lidarr.persistence.chownMedia=false

Related Issues

Fixes #71