feat(env): adicionar variáveis de ambiente para webhook

Adiciona novas variáveis para controlar o comportamento dos webhooks:
- WEBHOOK_REQUEST_TIMEOUT_MS: tempo máximo de espera
- WEBHOOK_RETRY_MAX_ATTEMPTS: número máximo de tentativas
- WEBHOOK_RETRY_INITIAL_DELAY_SECONDS: intervalo inicial
- WEBHOOK_RETRY_USE_EXPONENTIAL_BACKOFF: ativar backoff exponencial
- WEBHOOK_RETRY_MAX_DELAY_SECONDS: intervalo máximo entre tentativas
- WEBHOOK_RETRY_JITTER_FACTOR: fator de aleatoriedade
- WEBHOOK_RETRY_NON_RETRYABLE_STATUS_CODES: códigos de erro permanentes

Issue: #1325

Author: guilhermejansen

.env.example

@@ -173,6 +173,16 @@ WEBHOOK_EVENTS_TYPEBOT_CHANGE_STATUS=false
 WEBHOOK_EVENTS_ERRORS=false
 WEBHOOK_EVENTS_ERRORS_WEBHOOK=
 
+# Webhook timeout and retry configuration
+WEBHOOK_REQUEST_TIMEOUT_MS=60000 
+WEBHOOK_RETRY_MAX_ATTEMPTS=10
+WEBHOOK_RETRY_INITIAL_DELAY_SECONDS=5
+WEBHOOK_RETRY_USE_EXPONENTIAL_BACKOFF=true
+WEBHOOK_RETRY_MAX_DELAY_SECONDS=300
+WEBHOOK_RETRY_JITTER_FACTOR=0.2
+# Comma separated list of HTTP status codes that should not trigger retries
+WEBHOOK_RETRY_NON_RETRYABLE_STATUS_CODES=400,401,403,404,422
+
 # Name that will be displayed on smartphone connection
 CONFIG_SESSION_PHONE_CLIENT=Evolution API
 # Browser Name = Chrome | Firefox | Edge | Opera | Safari