feat(cloud): Add support for viewing status of SSL in custom domains (#12011)

# Pull Request Template

## Description

Fixes
[CW-4620](https://linear.app/chatwoot/issue/CW-4620/rethinking-custom-domains-in-chatwoot)

<img width="642" height="187" alt="Screenshot 2025-07-29 at 8 17 44 PM"
src="https://github.com/user-attachments/assets/ad2f5dac-4b27-4dce-93ca-6cbba74443fb"
/>


## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?



## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Vishnu Narayanan <iamwishnu@gmail.com>
Co-authored-by: Pranav <pranavrajs@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/controllers/api/v1/accounts/portals_controller.rb

@@ -47,6 +47,20 @@ class Api::V1::Accounts::PortalsController < Api::V1::Accounts::BaseController
     head :ok
   end
 
+  def send_instructions
+    email = permitted_params[:email]
+    return render_could_not_create_error(I18n.t('portals.send_instructions.email_required')) if email.blank?
+    return render_could_not_create_error(I18n.t('portals.send_instructions.invalid_email_format')) unless valid_email?(email)
+    return render_could_not_create_error(I18n.t('portals.send_instructions.custom_domain_not_configured')) if @portal.custom_domain.blank?
+
+    PortalInstructionsMailer.send_cname_instructions(
+      portal: @portal,
+      recipient_email: email
+    ).deliver_later
+
+    render json: { message: I18n.t('portals.send_instructions.instructions_sent_successfully') }, status: :ok
+  end
+
   def process_attached_logo
     blob_id = params[:blob_id]
     blob = ActiveStorage::Blob.find_by(id: blob_id)
@@ -60,12 +74,12 @@ class Api::V1::Accounts::PortalsController < Api::V1::Accounts::BaseController
   end
 
   def permitted_params
-    params.permit(:id)
+    params.permit(:id, :email)
   end
 
   def portal_params
     params.require(:portal).permit(
-      :account_id, :color, :custom_domain, :header_text, :homepage_link,
+      :id, :account_id, :color, :custom_domain, :header_text, :homepage_link,
       :name, :page_title, :slug, :archived, { config: [:default_locale, { allowed_locales: [] }] }
     )
   end
@@ -88,4 +102,10 @@ class Api::V1::Accounts::PortalsController < Api::V1::Accounts::BaseController
     domain = URI.parse(@portal.custom_domain)
     domain.is_a?(URI::HTTP) ? domain.host : @portal.custom_domain
   end
+
+  def valid_email?(email)
+    ValidEmail2::Address.new(email).valid?
+  end
 end
+
+Api::V1::Accounts::PortalsController.prepend_mod_with('Api::V1::Accounts::PortalsController')