Add SMTP configuration and documentation

- Update .env.example with SMTP variables
- Create docs/SMTP.md with credentials and usage examples
- Tested successfully on 2025-12-05

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.env.example

@@ -16,15 +16,14 @@ REMOTE_ACCESS_TOKEN_GRACE_MS=900000
 # SQLite database (local dev)
 DATABASE_URL=file:./prisma/db.dev.sqlite
 
-# Optional SMTP (dev)
-# SMTP_ADDRESS=localhost
-# SMTP_PORT=1025
-# SMTP_TLS=false
-# SMTP_USERNAME=
-# SMTP_PASSWORD=
-# SMTP_AUTHENTICATION=login
-# SMTP_ENABLE_STARTTLS_AUTO=false
-# MAILER_SENDER_EMAIL=no-reply@example.com
+# SMTP Configuration (production values in docs/SMTP.md)
+SMTP_HOST=smtp.c.inova.com.br
+SMTP_PORT=587
+SMTP_SECURE=false
+SMTP_USER=envio@rever.com.br
+SMTP_PASS=P@W#rvr00
+SMTP_FROM_NAME=Sistema de Chamados
+SMTP_FROM_EMAIL=envio@rever.com.br
 
 # Dev-only bypass to simplify local testing (do NOT enable in prod)
 # DEV_BYPASS_AUTH=0