* fix(chart): all-in-one deployment maxVolumes value
* chore(chart): improve readability
* fix(chart): maxVolume nil value check
* fix(chart): guard against nil/empty volume.dataDirs before calling first
Without this check, `first` errors when volume.dataDirs is nil or empty,
causing a template render failure for users who omit the setting entirely.
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Co-authored-by: Copilot <copilot@github.com>