feat: Add twilio content templates (#12277)

Implements comprehensive Twilio WhatsApp content template support (Phase
1) enabling text, media, and quick reply templates with proper parameter
conversion, sync capabilities, and feature flag protection.

###  Features Implemented

  **Template Types Supported**

  - Basic Text Templates: Simple text with variables ({{1}}, {{2}})
  - Media Templates: Image/Video/Document templates with text variables
  - Quick Reply Templates: Interactive button templates
- Phase 2 (Future): List Picker, Call-to-Action, Catalog, Carousel,
Authentication templates

  **Template Synchronization**

- API Endpoint: POST
/api/v1/accounts/{account_id}/inboxes/{inbox_id}/sync_templates
  - Background Job: Channels::Twilio::TemplatesSyncJob
  - Storage: JSONB format in channel_twilio_sms.content_templates
  - Auto-categorization: UTILITY, MARKETING, AUTHENTICATION categories

 ###  Template Examples Tested


  #### Text template
```
  { "name": "greet", "language": "en" }
```
  #### Template with variables
```
  { "name": "order_status", "parameters": [{"type": "body", "parameters": [{"text": "John"}]}] }
```

  #### Media template with image
```
  { "name": "product_showcase", "parameters": [
    {"type": "header", "parameters": [{"image": {"link": "image.jpg"}}]},
    {"type": "body", "parameters": [{"text": "iPhone"}, {"text": "$999"}]}
  ]}
```
#### Preview

<img width="1362" height="1058" alt="CleanShot 2025-08-26 at 10 01
51@2x"
src="https://github.com/user-attachments/assets/cb280cea-08c3-44ca-8025-58a96cb3a451"
/>

<img width="1308" height="1246" alt="CleanShot 2025-08-26 at 10 02
02@2x"
src="https://github.com/user-attachments/assets/9ea8537a-61e9-40f5-844f-eaad337e1ddd"
/>

#### User guide

https://www.chatwoot.com/hc/user-guide/articles/1756195741-twilio-content-templates

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/helper/specs/URLHelper.spec.js

@@ -7,6 +7,7 @@ import {
   hasValidAvatarUrl,
   timeStampAppendedURL,
   getHostNameFromURL,
+  extractFilenameFromUrl,
 } from '../URLHelper';
 
 describe('#URL Helpers', () => {
@@ -263,4 +264,58 @@ describe('#URL Helpers', () => {
       expect(getHostNameFromURL('https://chatwoot.help')).toBe('chatwoot.help');
     });
   });
+
+  describe('extractFilenameFromUrl', () => {
+    it('should extract filename from a valid URL', () => {
+      expect(
+        extractFilenameFromUrl('https://example.com/path/to/file.jpg')
+      ).toBe('file.jpg');
+      expect(extractFilenameFromUrl('https://example.com/image.png')).toBe(
+        'image.png'
+      );
+      expect(
+        extractFilenameFromUrl(
+          'https://example.com/folder/document.pdf?query=1'
+        )
+      ).toBe('document.pdf');
+      expect(
+        extractFilenameFromUrl('https://example.com/file.txt#section')
+      ).toBe('file.txt');
+    });
+
+    it('should handle URLs without filename', () => {
+      expect(extractFilenameFromUrl('https://example.com/')).toBe(
+        'https://example.com/'
+      );
+      expect(extractFilenameFromUrl('https://example.com')).toBe(
+        'https://example.com'
+      );
+    });
+
+    it('should handle invalid URLs gracefully', () => {
+      expect(extractFilenameFromUrl('not-a-url/file.txt')).toBe('file.txt');
+      expect(extractFilenameFromUrl('invalid-url')).toBe('invalid-url');
+    });
+
+    it('should handle edge cases', () => {
+      expect(extractFilenameFromUrl('')).toBe('');
+      expect(extractFilenameFromUrl(null)).toBe(null);
+      expect(extractFilenameFromUrl(undefined)).toBe(undefined);
+      expect(extractFilenameFromUrl(123)).toBe(123);
+    });
+
+    it('should handle URLs with query parameters and fragments', () => {
+      expect(
+        extractFilenameFromUrl(
+          'https://example.com/file.jpg?size=large&format=png'
+        )
+      ).toBe('file.jpg');
+      expect(
+        extractFilenameFromUrl('https://example.com/file.pdf#page=1')
+      ).toBe('file.pdf');
+      expect(
+        extractFilenameFromUrl('https://example.com/file.doc?v=1#section')
+      ).toBe('file.doc');
+    });
+  });
 });