chore: Automate SSL with Cloudflare (#12021)

This PR adds support for automatic SSL issuance using Cloudflare when a
custom domain is updated.

- Introduced a cloudflare configuration. If present, the system will
attempt to issue an SSL certificate via Cloudflare whenever a custom
domain is added or changed.
- SSL verification is handled using an HTTP challenge.
- The job will store the HTTP challenge response provided by Cloudflare
and serve it under the /.well-known/cf path automatically.

How to test:

- Create a Cloudflare zone for your domain and copy the Zone ID.
- Generate a Cloudflare API token with the required SSL certificate
permissions.
- Set the Fallback Origin under SSL -> Custom HostName to the Chatwoot
installation.
- Add or update a custom domain and verify that the SSL certificate is
automatically issued.

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

enterprise/app/controllers/enterprise/super_admin/app_configs_controller.rb

@@ -34,6 +34,6 @@ module Enterprise::SuperAdmin::AppConfigsController
   def internal_config_options
     %w[CHATWOOT_INBOX_TOKEN CHATWOOT_INBOX_HMAC_KEY ANALYTICS_TOKEN CLEARBIT_API_KEY DASHBOARD_SCRIPTS INACTIVE_WHATSAPP_NUMBERS BLOCKED_EMAIL_DOMAINS
        CAPTAIN_CLOUD_PLAN_LIMITS ACCOUNT_SECURITY_NOTIFICATION_WEBHOOK_URL CHATWOOT_INSTANCE_ADMIN_EMAIL
-       OG_IMAGE_CDN_URL OG_IMAGE_CLIENT_REF]
+       OG_IMAGE_CDN_URL OG_IMAGE_CLIENT_REF CLOUDFLARE_API_KEY CLOUDFLARE_ZONE_ID]
   end
 end