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

app/javascript/dashboard/api/inboxes.js

@@ -42,6 +42,12 @@ class Inboxes extends CacheEnabledApiClient {
   getCSATTemplateStatus(inboxId) {
     return axios.get(`${this.url}/${inboxId}/csat_template`);
   }
+
+  analyzeCSATTemplateUtility(inboxId, template) {
+    return axios.post(`${this.url}/${inboxId}/csat_template/analyze`, {
+      template,
+    });
+  }
 }
 
 export default new Inboxes();