feat: Bulk delete for contacts (#12778)

Introduces a new bulk action `delete` for contacts

ref: https://github.com/chatwoot/chatwoot/pull/12763

## Screens

<img width="1492" height="973" alt="Screenshot 2025-10-31 at 6 27 21 PM"
src="https://github.com/user-attachments/assets/30dab1bb-2c2c-4168-9800-44e0eb5f8e3a"
/>
<img width="1492" height="985" alt="Screenshot 2025-10-31 at 6 27 32 PM"
src="https://github.com/user-attachments/assets/5be610c4-b19e-4614-a164-103b22337382"
/>

app/services/contacts/bulk_action_service.rb

@@ -6,6 +6,7 @@ class Contacts::BulkActionService
   end
 
   def perform
+    return delete_contacts if delete_requested?
     return assign_labels if labels_to_add.any?
 
     Rails.logger.warn("Unknown contact bulk operation payload: #{@params.keys}")
@@ -22,6 +23,13 @@ class Contacts::BulkActionService
     ).perform
   end
 
+  def delete_contacts
+    Contacts::BulkDeleteService.new(
+      account: @account,
+      contact_ids: ids
+    ).perform
+  end
+
   def ids
     Array(@params[:ids]).compact
   end
@@ -29,4 +37,8 @@ class Contacts::BulkActionService
   def labels_to_add
     @labels_to_add ||= Array(@params.dig(:labels, :add)).reject(&:blank?)
   end
+
+  def delete_requested?
+    @params[:action_name] == 'delete'
+  end
 end

app/services/contacts/bulk_delete_service.rb

@@ -0,0 +1,18 @@
+class Contacts::BulkDeleteService
+  def initialize(account:, contact_ids: [])
+    @account = account
+    @contact_ids = Array(contact_ids).compact
+  end
+
+  def perform
+    return if @contact_ids.blank?
+
+    contacts.find_each(&:destroy!)
+  end
+
+  private
+
+  def contacts
+    @account.contacts.where(id: @contact_ids)
+  end
+end