feat: add Community Ads SMS provider

[yousra-ashraf]

Summary

Adds Community Ads as a first-class SMS driver in Resala, following the same pattern as existing providers (config, driver, response mapping, env stub, and artisan resala:make).

This lets Laravel/PHP apps send SMS through Community Ads without custom HTTP glue. Recipients can be a single number or a comma-separated list. Gateway numeric status codes are mapped to readable success/error messages.

Changes

• CommunityAdsDriver — JSON POST to SendSMS (SMSText, SMSReceiver, SMSSender, SMSLang, credentials, unique SMSID)
• CommunityAdsResponse — parse numeric status (0 = success) and map known error codes
• Register community_ads in config/resala.php and document it in the README
• Env stub + php artisan resala:make community_ads

Config / env

php artisan resala:make community_ads