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/api-gateway/app/core/config.py

@@ -17,6 +17,7 @@ class Settings(BaseSettings):
 
     # WhatsApp Core
     WHATSAPP_CORE_URL: str = "http://localhost:3001"
+    WHATSAPP_CORE_PUBLIC_URL: str = "http://localhost:3001"  # URL accessible from browser
 
     # Flow Engine
     FLOW_ENGINE_URL: str = "http://localhost:8001"
@@ -24,6 +25,9 @@ class Settings(BaseSettings):
     # Integrations
     INTEGRATIONS_URL: str = "http://localhost:8002"
 
+    # Odoo Webhook
+    ODOO_WEBHOOK_URL: str = ""  # e.g., "http://192.168.10.188:8069/whatsapp/webhook"
+
     # CORS
     CORS_ORIGINS: str = "http://localhost:5173,http://localhost:3000"