docs: Update .env.example with all environment variables

- Add all variables from current .env file
- Include comprehensive comments and descriptions
- Add sample values for development/production
- Organize by category for clarity

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

.env.example

@@ -1,59 +1,118 @@
 # ========================================
 # OpenCCB Environment Configuration
 # ========================================
-# NOTA: Este archivo es solo un ejemplo.
-# El script deploy-ssl.sh generará valores seguros automáticamente.
+# Copia este archivo a .env y configura tus variables
+# cp .env.example .env
 # ========================================
 
 # ----------------------------------------
 # 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
+# DB_PASSWORD: Genera uno seguro con: ./generate_jwt_secret.sh
+DB_PASSWORD=tu_password_seguro
 
-# 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
+# JWT_SECRET: Genera uno seguro con: ./generate_jwt_secret.sh
+JWT_SECRET=tu_jwt_secret_seguro
 
+# Database URLs
+# Producción (Docker): db:5432
+# Desarrollo (Local): localhost:5433 o localhost:5434
+CMS_DATABASE_URL=postgresql://user:DB_PASSWORD@localhost:5433/openccb_cms
+LMS_DATABASE_URL=postgresql://user:DB_PASSWORD@localhost:5433/openccb_lms
+DATABASE_URL=postgresql://user:DB_PASSWORD@localhost:5433/openccb_cms
+
+# SAM Database (External MySQL)
+SAM_DATABASE_URL=mysql://usuario:password@host:3306/sige_sam_v3
+
+# Bridge Database
+BRIDGE_DATABASE_URL=postgresql://user:password@localhost:5432/openccb_cms?sslmode=disable
+
+# ----------------------------------------
 # Logging
+# ----------------------------------------
 RUST_LOG=info
+# Opciones: error, warn, info, debug, trace
 
+# ----------------------------------------
+# Environment
+# ----------------------------------------
+ENVIRONMENT=dev
+# Opciones: dev, prod
+
+# ----------------------------------------
 # Let's Encrypt Configuration
+# ----------------------------------------
+LETSENCRYPT_STAGING=true
 # 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
-OPENAI_API_KEY=
+# Opciones: 'openai' o 'local'
+
+OPENAI_API_KEY=tu_api_key_de_openai
 
 # Local AI (Ollama & Whisper)
 LOCAL_WHISPER_URL=http://localhost:9000
 LOCAL_OLLAMA_URL=http://localhost:11434
-LOCAL_LLM_MODEL=llama3.2:3b
 
-# Embedding Model for semantic search (pgvector)
+# Model Configuration - Optimized for each use case
+LOCAL_LLM_MODEL=llama3.2:3b
+# Chat/Tutor: llama3.2:3b - Rápido y eficiente para IA conversacional
+
+LOCAL_LLM_MODEL_COMPLEX=qwen3.5:9b
+# Razonamiento complejo/análisis: qwen3.5:9b
+
+LOCAL_LLM_MODEL_ADVANCED=gpt-oss:latest
+# Tareas pesadas: gpt-oss:latest - Modelo más capaz
+
+# Embeddings: nomic-embed-text - Optimizado para búsqueda semántica
 EMBEDDING_MODEL=nomic-embed-text
 
+# Audio transcription (Whisper)
+WHISPER_MODEL=whisper-large-v3
+
+# Bark TTS API (Text-to-Speech para preguntas)
+BARK_API_URL=http://localhost:8443
+
+# ----------------------------------------
+# Development URLs (Red local)
+# ----------------------------------------
+DEV_OLLAMA_URL=http://t-800.norteamericano.cl:11434
+DEV_WHISPER_URL=http://t-800.norteamericano.cl:9000
+DEV_BARK_URL=http://t-800:8000
+
+# ----------------------------------------
+# Production URLs (Red local)
+# ----------------------------------------
+PROD_OLLAMA_URL=http://t-800.norteamericano.cl:11434
+PROD_WHISPER_URL=http://t-800.norteamericano.cl:9000
+
+# Video Bridge URL
+LOCAL_VIDEO_BRIDGE_URL=http://t-800.norteamericano.cl:8080
+
+# ----------------------------------------
 # Mercado Pago Configuration
-MP_ACCESS_TOKEN=
-MP_PUBLIC_KEY=
-MP_WEBHOOK_SECRET=
+# ----------------------------------------
+MP_ACCESS_TOKEN=tu_access_token_de_mercado_pago
+MP_PUBLIC_KEY=tu_public_key_de_mercado_pago
+MP_WEBHOOK_SECRET=tu_webhook_secret_de_mercado_pago
 MP_BACK_URL_SUCCESS=http://localhost:3003/payments/success
 MP_BACK_URL_FAILURE=http://localhost:3003/payments/failure
 MP_NOTIFICATION_URL=
 
+# ----------------------------------------
 # External MySQL Integration
-MYSQL_DATABASE_URL=mysql://db_user:db_password@localhost:3306/external_database_name
+# ----------------------------------------
+MYSQL_DATABASE_URL=mysql://usuario:password@host:3306/base_de_datos
 EXTERNAL_TABLE_GRADES=notas
 EXTERNAL_ID_TIPO_NOTA=1
 
+# ----------------------------------------
 # Branding Defaults
+# ----------------------------------------
 DEFAULT_ORG_NAME="Norteamericano"
 DEFAULT_PLATFORM_NAME="Norteamericano Learning"
 DEFAULT_LOGO_URL=""
@@ -61,8 +120,9 @@ DEFAULT_FAVICON_URL=""
 DEFAULT_PRIMARY_COLOR="#3B82F6"
 DEFAULT_SECONDARY_COLOR="#8B5CF6"
 
+# ----------------------------------------
 # Frontend API URLs (Producción)
+# ----------------------------------------
 # Estas URLs se usan para el build del frontend y deben apuntar a los dominios públicos
 NEXT_PUBLIC_CMS_API_URL=https://studio.norteamericano.com
 NEXT_PUBLIC_LMS_API_URL=https://learning.norteamericano.com
-