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

spec/services/whatsapp/csat_template_service_spec.rb

@@ -119,7 +119,7 @@ RSpec.describe Whatsapp::CsatTemplateService do
       expect(result).to eq({
                              name: expected_template_name,
                              language: 'en',
-                             category: 'MARKETING',
+                             category: 'UTILITY',
                              components: [
                                {
                                  type: 'BODY',
@@ -169,7 +169,7 @@ RSpec.describe Whatsapp::CsatTemplateService do
       expected_body = {
         name: expected_template_name,
         language: 'en',
-        category: 'MARKETING',
+        category: 'UTILITY',
         components: [
           {
             type: 'BODY',