FEAT: vCard contact import/export

[andrinoff]

Is your feature request related to a problem?

Contacts can't be imported from or exported to standard vCard files.

Describe the solution you'd like

Add CLI commands to import/export contacts as .vcf (vCard).

Describe alternatives you've considered

Manual contact entry.

Additional context

See cli/contacts_export.go and cli/contacts_sync.go.

[floatpanebot]

Thanks for the suggestion!

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