fix: return public contact inbox payload after update (#14946)

# Pull Request Template

## Description
This keeps the public inbox contact update response on the public
contact inbox serializer shape after applying the contact identify
update.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update

## How Has This Been Tested?

- `bundle exec rspec
spec/controllers/public/api/v1/inbox/contacts_controller_spec.rb`

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my own code
- [ ] I have commented 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

Fixes
[https://linear.app/chatwoot/issue/CW-6937](https://linear.app/chatwoot/issue/CW-6937)
Fixes
[https://linear.app/chatwoot/issue/CW-7464](https://linear.app/chatwoot/issue/CW-7464)
Fixes
[https://linear.app/chatwoot/issue/CW-7457](https://linear.app/chatwoot/issue/CW-7457)

app/controllers/public/api/v1/inboxes/contacts_controller.rb

@@ -18,7 +18,8 @@ class Public::Api::V1::Inboxes::ContactsController < Public::Api::V1::InboxesCon
       contact: @contact_inbox.contact,
       params: permitted_params.to_h.deep_symbolize_keys.except(:identifier)
     )
-    render json: contact_identify_action.perform
+    contact_identify_action.perform
+    @contact_inbox.reload
   end
 
   private

spec/controllers/public/api/v1/inbox/contacts_controller_spec.rb

@@ -47,5 +47,17 @@ RSpec.describe 'Public Inbox Contacts API', type: :request do
       data = response.parsed_body
       expect(data['name']).to eq 'John Smith'
     end
+
+    it 'does not expose internal contact columns' do
+      contact.update!(identifier: 'contact-identifier', custom_attributes: { tier: 'vip' }, additional_attributes: { company_name: 'Acme' })
+
+      patch "/public/api/v1/inboxes/#{api_channel.identifier}/contacts/#{contact_inbox.source_id}",
+            params: { name: 'John Smith' }
+
+      expect(response).to have_http_status(:success)
+      data = response.parsed_body
+      expect(data.keys).to include('email', 'id', 'name', 'phone_number', 'pubsub_token', 'source_id')
+      expect(data.keys).not_to include('account_id', 'identifier', 'custom_attributes', 'additional_attributes', 'company_id')
+    end
   end
 end