feat: Major WhatsApp integration update with Odoo and pause/resume

## Frontend
- Add media display (images, audio, video, docs) in Inbox
- Add pause/resume functionality for WhatsApp accounts
- Fix media URLs to use nginx proxy (relative URLs)

## API Gateway
- Add /accounts/:id/pause and /accounts/:id/resume endpoints
- Fix media URL handling for browser access

## WhatsApp Core
- Add pauseSession() - disconnect without logout
- Add resumeSession() - reconnect using saved credentials
- Add media download and storage for incoming messages
- Serve media files via /media/ static route

## Odoo Module (odoo_whatsapp_hub)
- Add Chat Hub interface with DOLLARS theme (dark, 3-column layout)
- Add WhatsApp/DRRR theme switcher for chat view
- Add "ABRIR CHAT" button in conversation form
- Add send_message_from_chat() method
- Add security/ir.model.access.csv
- Fix CSS scoping to avoid breaking Odoo UI
- Update webhook to handle message events properly

## Documentation
- Add docs/CONTEXTO_DESARROLLO.md with complete project context

## Infrastructure
- Add whatsapp_media Docker volume
- Configure nginx proxy for /media/ route
- Update .gitignore to track src/sessions/ source files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

odoo_whatsapp_hub/models/whatsapp_account.py

@@ -59,9 +59,9 @@ class WhatsAppAccount(models.Model):
             raise UserError('Esta cuenta no está vinculada a WhatsApp Central')
 
         try:
+            # Use internal endpoint (no auth required)
             response = requests.get(
-                f'{self.api_url}/api/whatsapp/accounts/{self.external_id}',
-                headers=self._get_headers(),
+                f'{self.api_url}/api/whatsapp/internal/odoo/accounts/{self.external_id}',
                 timeout=10,
             )
             if response.status_code == 200:
@@ -71,7 +71,9 @@ class WhatsAppAccount(models.Model):
                     'phone_number': data.get('phone_number'),
                     'qr_code': data.get('qr_code'),
                 })
-        except Exception as e:
+            else:
+                raise UserError(f'Error del servidor: {response.status_code}')
+        except requests.exceptions.RequestException as e:
             _logger.error(f'Error syncing WhatsApp account: {e}')
             raise UserError(f'Error de conexión: {e}')