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>

docs/SMTP.md

@@ -0,0 +1,73 @@
+# Configuracao SMTP
+
+Configuracao do servidor de email para envio de notificacoes do sistema.
+
+## Credenciais
+
+| Campo | Valor |
+|-------|-------|
+| Host | `smtp.c.inova.com.br` |
+| Porta | `587` |
+| TLS/SSL | STARTTLS (secure: false) |
+| Usuario | `envio@rever.com.br` |
+| Senha | `P@W#rvr00` |
+| Remetente | `Sistema de Chamados <envio@rever.com.br>` |
+
+## Variaveis de Ambiente
+
+```bash
+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
+```
+
+## Exemplo de Uso (Nodemailer)
+
+```typescript
+import nodemailer from "nodemailer"
+
+const transporter = nodemailer.createTransport({
+  host: process.env.SMTP_HOST,
+  port: Number(process.env.SMTP_PORT),
+  secure: process.env.SMTP_SECURE === "true",
+  auth: {
+    user: process.env.SMTP_USER,
+    pass: process.env.SMTP_PASS,
+  },
+  tls: {
+    rejectUnauthorized: false,
+  },
+})
+
+await transporter.sendMail({
+  from: `"${process.env.SMTP_FROM_NAME}" <${process.env.SMTP_FROM_EMAIL}>`,
+  to: "destinatario@exemplo.com",
+  subject: "Assunto do email",
+  html: "<p>Conteudo do email</p>",
+})
+```
+
+## Teste Realizado
+
+- **Data**: 2025-12-05
+- **Resultado**: Sucesso
+- **Message ID**: `<2df8cfca-0c56-7710-2f10-290961e3f1b7@rever.com.br>`
+- **Resposta**: `250 2.0.0 Ok: queued as 4D4C91402426A`
+
+## Configuracao na VPS
+
+Adicionar as variaveis ao arquivo de secrets do Docker Swarm ou ao `.env` de producao:
+
+```bash
+# Via SSH na VPS
+ssh -i ~/.ssh/codex_ed25519 root@154.12.253.40
+
+# Editar o arquivo de ambiente do servico web
+nano /root/sistema/.env
+
+# Adicionar as variaveis SMTP listadas acima
+```