Resolve an imports options_source key into selectable value/label pairs
options_source instead of inline options.
It resolves backend-managed provider keys such as countries, logistics_tocs, and fuels
into a simple list of selectable values:
value: the canonical value the backend validates and storeslabel: the display label a client can show in dropdowns or selectorsoptions_source.Supported keys currently include:countrieslogistics_tocsfuelsGET /v2/imports/templates/{template_id}.options, render those directly.options_source, call GET /v2/imports/options/{source_key}.value / label pairs in the UI.country may use options_source="countries"fuel may use options_source="fuels" for canonical logistics recharge fuel namestoc may use options_source="logistics_tocs"source_key
options_source key.