feat: template delete, orphaned namespaces, definition update-chart

[omattsson]

Summary

Adds CLI commands for three related issues:

• stackctl template delete — confirmation-prompted template deletion using the existing deleteByID pattern (feat: add template delete command to stackctl CLI #43)
• stackctl orphaned list/delete — list and clean up Kubernetes namespaces that have the stack-manager label but no matching DB record (Add orphaned namespace management commands #44)
• stackctl definition update --branch — adds --branch flag to set default_branch on definitions (Add definition update and update-chart commands #46)
• stackctl definition update-chart — update a chart config within a definition using GET-merge-PUT to preserve unspecified fields; supports --chart-path, --chart-version, --deploy-order, --file (Add definition update and update-chart commands #46)

Changes

File	What
types.go	Add OrphanedNamespace, UpdateChartConfigRequest, DefaultBranch on UpdateDefinitionRequest
client.go	Add DeleteTemplate, ListOrphanedNamespaces, DeleteOrphanedNamespace, GetDefinitionChart, UpdateDefinitionChart
template.go	Add templateDeleteCmd
orphaned.go	New file — orphanedCmd, orphanedListCmd, orphanedDeleteCmd
definition.go	Add --branch flag to update, add definitionUpdateChartCmd with merge logic

Design notes

• update-chart fetches current chart config before updating so unspecified fields (chart_path, deploy_order, etc.) are preserved — addressing the root cause described in Add definition update and update-chart commands #46
• Path traversal checks on --file happen before any API calls
• --deploy-order uses sentinel default (-1) to distinguish "not set" from explicit 0

Test plan

• Template delete: yes flag, confirmation, decline, not-found, quiet output
• Orphaned list: table/JSON/quiet output, empty list, API error
• Orphaned delete: yes flag, confirmation, decline, not-found, quiet output
• Definition update --branch: branch-only update, no-flags error
• Definition update-chart: chart-version, values-from-file, deploy-order, no-flags error, JSON/quiet output, path traversal
• Full test suite green (go test ./...)

Closes #43, closes #44, closes #46

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