feat(csat): Add WhatsApp utility template analyzer with rewrite guidance (#13575)

CSAT templates for WhatsApp are submitted as Utility, but Meta may
reclassify them as Marketing based on content, which can significantly
increase messaging costs.
This PR introduces a Captain-powered CSAT template analyzer for
WhatsApp/Twilio WhatsApp that predicts utility fit, explains likely
risks, and suggests safer rewrites before submission. The flow is manual
(button-triggered), Captain-gated, and applies rewrites only on explicit
user action. It also updates UX copy to clearly set expectations: the
system submits as Utility, Meta makes the final categorization decision.

Fixes
https://linear.app/chatwoot/issue/CW-6424/ai-powered-whatsapp-template-classifier-for-csat-submissions


https://github.com/user-attachments/assets/8fd1d6db-2f91-447c-9771-3de271b16fd9

config/routes.rb

@@ -224,7 +224,9 @@ Rails.application.routes.draw do
               end
             end
 
-            resource :csat_template, only: [:show, :create], controller: 'inbox_csat_templates'
+            resource :csat_template, only: [:show, :create], controller: 'inbox_csat_templates' do
+              post :analyze, on: :collection
+            end
           end
 
           resources :inbox_members, only: [:create, :show], param: :inbox_id do