feat: Add INSTALLATION_NAME to global config (#12376)

# Pull Request Template

## Description

This PR fixes an issue where the widget and survey page did not show the
correct installation name in the “Powered by” label, and also updates
the Help Center to use the installation name.

Fixes
[CW-5580](https://linear.app/chatwoot/issue/CW-5580/widget-footer-shows-powered-by-chatwoot-after-45x-when-installation),
https://github.com/chatwoot/chatwoot/issues/12375#event-19521953660

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

### Screenshots

**Survey**
<img width="969" height="364" alt="image"
src="https://github.com/user-attachments/assets/094291cb-35dd-4654-ab12-97174c20be55"
/>

**Widget**
<img width="426" height="668" alt="image"
src="https://github.com/user-attachments/assets/7593bfbc-436f-4cc2-9be5-150178bafe30"
/>

**HC**
<img width="432" height="717" alt="image"
src="https://github.com/user-attachments/assets/106cfc25-409e-4e68-bddd-53b2d3e79400"
/>



## Checklist:

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

app/controllers/api/v1/widget/configs_controller.rb

@@ -9,7 +9,7 @@ class Api::V1::Widget::ConfigsController < Api::V1::Widget::BaseController
   private
 
   def set_global_config
-    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'WIDGET_BRAND_URL')
+    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'WIDGET_BRAND_URL', 'INSTALLATION_NAME')
   end
 
   def set_contact

app/controllers/public/api/v1/portals/base_controller.rb

@@ -58,6 +58,6 @@ class Public::Api::V1::Portals::BaseController < PublicController
   end
 
   def set_global_config
-    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'BRAND_URL')
+    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'BRAND_URL', 'INSTALLATION_NAME')
   end
 end

app/controllers/survey/responses_controller.rb

@@ -5,6 +5,6 @@ class Survey::ResponsesController < ActionController::Base
   private
 
   def set_global_config
-    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'WIDGET_BRAND_URL')
+    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'WIDGET_BRAND_URL', 'INSTALLATION_NAME')
   end
 end

app/controllers/widgets_controller.rb

@@ -14,7 +14,7 @@ class WidgetsController < ActionController::Base
   private
 
   def set_global_config
-    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'WIDGET_BRAND_URL', 'DIRECT_UPLOADS_ENABLED')
+    @global_config = GlobalConfig.get('LOGO_THUMBNAIL', 'BRAND_NAME', 'WIDGET_BRAND_URL', 'DIRECT_UPLOADS_ENABLED', 'INSTALLATION_NAME')
   end
 
   def set_web_widget

app/views/public/api/v1/portals/_footer.html.erb

@@ -11,7 +11,7 @@
         <p class="text-slate-700 dark:text-slate-300 text-sm font-medium text-center">
           <%= I18n.t('public_portal.footer.made_with') %>
 
-            <a class="hover:underline" href="<%= generate_portal_brand_url(@global_config['BRAND_URL'], request.referer) %>" target="_blank" rel="noopener noreferrer nofollow"><%= @global_config['BRAND_NAME'] %></a>
+            <a class="hover:underline" href="<%= generate_portal_brand_url(@global_config['BRAND_URL'], request.referer) %>" target="_blank" rel="noopener noreferrer nofollow"><%= @global_config['INSTALLATION_NAME'] %></a>
 
         </p>
     </div>