List location templates
Return the gallery of single-location presets. Each entry describes the site (country, parking type) plus every charger group it will provision (brand, model, connector type, OCPP version, count, nominal kW). The ``type`` field (AC, DC, or AC-DC) is derived from the connectors in the template so the UI can filter or tab between power families without parsing the groups. Use the slug inside ``POST /ocpi/cpos/{cpo_id}/locations`` via ``{"template": "<slug>"}``.