feat: Voice channel creation Flow (#11775)

This PR introduces a new channel type for voice conversations.

ref: #11481 

## Changes

- Add database migration for channel_voice table with phone_number and
provider_config
- Create Channel::Voice model with E.164 phone number validation and
Twilio config validation
- Add voice channel association to Account model
- Extend inbox helpers and types to support voice channels
- Add voice channel setup UI with Twilio configuration form
- Include voice channel in channel factory and list components
- Add API routes and store actions for voice channel creation
- Add comprehensive translations for voice channel management

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>

app/javascript/dashboard/components/widgets/ChannelItem.vue

@@ -41,6 +41,10 @@ export default {
         );
       }
 
+      if (key === 'voice') {
+        return this.enabledFeatures.channel_voice;
+      }
+
       return [
         'website',
         'twilio',
@@ -50,6 +54,7 @@ export default {
         'telegram',
         'line',
         'instagram',
+        'voice',
       ].includes(key);
     },
   },