feat: SAM integration, deployment scripts, and audio response enhancements

- Add SAM (Sistema de Administración Académica) integration with sync endpoints
- Add deployment automation (deploy.sh, remote-setup.sh, setup-nginx-ssl.sh)
- Add nginx proxy configuration for SSL with Let's Encrypt
- Add audio response support for student lessons (migrations, handlers)
- Add audio evaluations admin page
- Update CORS to support wildcard subdomains for norteamericano.cl
- Add comprehensive deployment documentation (DESPLIEGUE.md, ManualDeConfiguracion.md)
- Update docker-compose.yml with nginx-proxy and acme-companion services
- Remove outdated documentation files

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

.env.example

@@ -1,18 +1,32 @@
-# Database URLs for local development (outside Docker)
-# Change 'db' to 'localhost' if running the services natively
-# NOTE: If port 5432 is occupied, use 5433 instead
-CMS_DATABASE_URL=postgresql://user:password@localhost:5433/openccb_cms
-LMS_DATABASE_URL=postgresql://user:password@localhost:5433/openccb_lms
+# ========================================
+# OpenCCB Environment Configuration
+# ========================================
+# NOTA: Este archivo es solo un ejemplo.
+# El script deploy-ssl.sh generará valores seguros automáticamente.
+# ========================================
 
-# General fallback
-DATABASE_URL=postgresql://user:password@localhost:5433/openccb_cms
+# ----------------------------------------
+# Database Configuration
+# PRODUCCIÓN (Docker): Usar db:5432
+# DESARROLLO (Local): Usar localhost:5434
+# El script deploy-ssl.sh generará un valor seguro si no existe
+# ----------------------------------------
+DB_PASSWORD=CHANGE_ME_GENERATE_SECURE_PASSWORD
+JWT_SECRET=CHANGE_ME_GENERATE_SECURE_SECRET
 
-# JWT Secret (generate with ./generate_jwt_secret.sh)
-JWT_SECRET=supersecret
+# Database URLs (producción: db:5432, desarrollo: localhost:5434)
+CMS_DATABASE_URL=postgresql://user:DB_PASSWORD@db:5432/openccb_cms
+LMS_DATABASE_URL=postgresql://user:DB_PASSWORD@db:5432/openccb_lms
+DATABASE_URL=postgresql://user:DB_PASSWORD@db:5432/openccb_cms
 
 # Logging
 RUST_LOG=info
 
+# Let's Encrypt Configuration
+# true = Staging (certificados de prueba, sin rate limits)
+# false = Production (certificados reales, con rate limits)
+LETSENCRYPT_STAGING=true
+
 # AI Configuration
 # Providers: 'openai' or 'local'
 AI_PROVIDER=local
@@ -25,7 +39,7 @@ LOCAL_LLM_MODEL=llama3.2:3b
 
 # Embedding Model for semantic search (pgvector)
 EMBEDDING_MODEL=nomic-embed-text
- 
+
 # Mercado Pago Configuration
 MP_ACCESS_TOKEN=
 MP_PUBLIC_KEY=