Issue #3569589: Add international SMS support (smsapi.com, smsapi.se, smsapi.bg)

Grzegorz Bartmanrequested to merge
issue/smsapi-3569589:3569589-international-sms-support into 1.x
  • Add smsapi_service_region config option (PL, COM, SE, BG)
  • Add region selector dropdown in configuration form
  • Add getService() helper method to return correct service based on region
  • Replace all hardcoded smsapiPlService() calls with getService()
  • Default to 'PL' for backward compatibility

Closes #3569589

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