WhatsApp API returns "(#100) Invalid parameter — Parameter name is
missing or empty" for templates that use named variables.
- chat.php sendTemplate(): collect params as [{name, value}] objects
using data-var-index as the parameter name
- WhatsAppService::sendTemplateMessage(): handle {name, value} objects
in the indexed-array path by emitting {type, parameter_name, text}
(backward-compatible — plain strings still work as positional params)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
