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>

app/models/portal.rb

@@ -12,6 +12,7 @@
 #  name                  :string           not null
 #  page_title            :string
 #  slug                  :string           not null
+#  ssl_settings          :jsonb            not null
 #  created_at            :datetime         not null
 #  updated_at            :datetime         not null
 #  account_id            :integer          not null
@@ -69,3 +70,5 @@ class Portal < ApplicationRecord
     errors.add(:cofig, "in portal on #{denied_keys.join(',')} is not supported.") if denied_keys.any?
   end
 end
+
+Portal.include_mod_with('Concerns::Portal')