feat(aula-14): adicionar Istio Traffic Splitting com canary deployment

- Instala Istio (base + istiod + ingressgateway)
- Configura Kiali e Jaeger para observabilidade
- Deploy de app-backend v1 e v2 com traffic splitting 90/10
- Integra com Victoria Metrics da aula-12
- Inclui teste-stress.sh para validar distribuição de tráfego
- Tráfego externo passa pelo Istio Gateway via NGINX Ingress

aula-14/cleanup.sh

@@ -0,0 +1,116 @@
+#!/bin/bash
+# ============================================================================
+# Aula 14 - Cleanup do Istio Traffic Splitting
+# ============================================================================
+# Remove todos os componentes instalados pelo setup.sh:
+#   - Namespace istio (aplicação)
+#   - Kiali, Jaeger (addons)
+#   - Istio (istiod + base)
+#   - Ingress resources
+#
+# Mantém:
+#   - Cluster Kubernetes
+#   - GitLab e Registry (aula-10)
+#   - Outros namespaces
+# ============================================================================
+
+set -e
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+CYAN='\033[0;36m'
+NC='\033[0m'
+
+log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
+log_success() { echo -e "${GREEN}[OK]${NC} $1"; }
+log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
+log_error() { echo -e "${RED}[ERRO]${NC} $1"; }
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo ""
+echo -e "${CYAN}╔═══════════════════════════════════════════════════════════╗${NC}"
+echo -e "${CYAN}║  Cleanup - Aula 14 Istio Traffic Splitting                ║${NC}"
+echo -e "${CYAN}╚═══════════════════════════════════════════════════════════╝${NC}"
+echo ""
+echo -e "${YELLOW}Este script irá remover:${NC}"
+echo "  - Namespace 'istio' com aplicação"
+echo "  - Addons: Kiali, Jaeger"
+echo "  - Istio: istiod e istio-base"
+echo "  - Ingress do Kiali e Jaeger"
+echo ""
+read -p "Continuar? (digite 'sim' para confirmar): " confirm
+if [[ "$confirm" != "sim" ]]; then
+    log_info "Operação cancelada"
+    exit 0
+fi
+
+echo ""
+
+# Remover pod de teste
+log_info "Removendo pod de teste..."
+kubectl delete pod curl-test -n istio --ignore-not-found=true 2>/dev/null || true
+
+# Remover namespace istio (aplicação demo)
+if kubectl get namespace istio &> /dev/null; then
+    log_info "Removendo namespace istio..."
+    kubectl delete namespace istio --wait=false 2>/dev/null || true
+    log_success "Namespace istio marcado para remoção"
+else
+    log_info "Namespace istio não encontrado"
+fi
+
+# Remover Ingress
+log_info "Removendo Ingress..."
+kubectl delete ingress kiali jaeger -n istio-system --ignore-not-found=true 2>/dev/null || true
+log_success "Ingress removidos"
+
+# Remover addons (Kiali, Jaeger)
+log_info "Removendo Kiali..."
+kubectl delete -f https://raw.githubusercontent.com/istio/istio/release-1.24/samples/addons/kiali.yaml 2>/dev/null || true
+
+log_info "Removendo Jaeger..."
+kubectl delete -f https://raw.githubusercontent.com/istio/istio/release-1.24/samples/addons/jaeger.yaml 2>/dev/null || true
+log_success "Addons removidos"
+
+# Remover istiod
+if helm status istiod -n istio-system &> /dev/null; then
+    log_info "Removendo istiod..."
+    helm uninstall istiod -n istio-system --wait
+    log_success "istiod removido"
+else
+    log_info "istiod não encontrado"
+fi
+
+# Remover istio-base
+if helm status istio-base -n istio-system &> /dev/null; then
+    log_info "Removendo istio-base..."
+    helm uninstall istio-base -n istio-system --wait
+    log_success "istio-base removido"
+else
+    log_info "istio-base não encontrado"
+fi
+
+# Remover namespace istio-system
+if kubectl get namespace istio-system &> /dev/null; then
+    log_info "Removendo namespace istio-system..."
+    kubectl delete namespace istio-system --wait=false 2>/dev/null || true
+    log_success "Namespace istio-system marcado para remoção"
+fi
+
+# Remover arquivo .env
+echo ""
+read -p "Remover arquivo .env? [s/N]: " remove_env
+if [[ "$remove_env" == "s" || "$remove_env" == "S" ]]; then
+    rm -f "${SCRIPT_DIR}/.env"
+    log_success "Arquivo .env removido"
+fi
+
+echo ""
+echo -e "${GREEN}Cleanup concluído.${NC}"
+echo ""
+echo "Aguarde alguns minutos para os namespaces serem removidos completamente."
+echo "Verificar: kubectl get ns"
+echo ""