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>

services/whatsapp-core/package.json

@@ -10,7 +10,8 @@
     "lint": "eslint src/**/*.ts"
   },
   "dependencies": {
-    "@whiskeysockets/baileys": "^6.7.16",
+    "@whiskeysockets/baileys": "^6.7.17",
+    "cors": "^2.8.5",
     "express": "^4.21.2",
     "socket.io": "^4.8.1",
     "ioredis": "^5.4.1",
@@ -19,6 +20,7 @@
     "uuid": "^11.0.5"
   },
   "devDependencies": {
+    "@types/cors": "^2.8.17",
     "@types/express": "^5.0.0",
     "@types/node": "^22.10.7",
     "@types/uuid": "^10.0.0",