refactor: remover todas as dependências do GitLab no workshop

- Aula 08: nginx-ingress TCP passthrough gitlab→gitea, comments
- Aula 09: add-client.sh API GitLab→Gitea
- Aula 11: node-bugado deployment image registry.kube.quest→gitea.kube.quest
- Aula 12: setup.sh/cleanup.sh API GitLab→Gitea, ArgoCD repoURL
- Aula 13: k8s manifests, benchmarks: registry.kube.quest→gitea.kube.quest,
           gitlab-registry→gitea-registry, GITLAB_TOKEN→GITEA_TOKEN
- Aula 14: comments GitLab→Gitea
- README raiz: arquitetura, tabela, DNS

aula-13/benchmarks/benchmark-clean.sh

@@ -11,7 +11,7 @@
 set -e
 
 NAMESPACE="benchmark-clean"
-ESTARGZ_IMAGE="registry.kube.quest/factory/postgresql:17"
+ESTARGZ_IMAGE="gitea.kube.quest/factory/postgresql:17"
 TRADITIONAL_IMAGE="postgres:17-alpine"
 TARGET_NODE="talos-msadg4-worker-0"  # Node sem cache
 
@@ -39,10 +39,10 @@ echo "      Ambiente limpo"
 # Criar namespace
 echo "[3/6] Criando namespace de teste..."
 kubectl create namespace $NAMESPACE
-kubectl create secret docker-registry gitlab-registry \
-    --docker-server=registry.kube.quest \
+kubectl create secret docker-registry gitea-registry \
+    --docker-server=gitea.kube.quest \
     --docker-username=root \
-    --docker-password="${GITLAB_TOKEN:-glpat-dummy}" \
+    --docker-password="${GITEA_TOKEN:-glpat-dummy}" \
     -n $NAMESPACE 2>/dev/null || true
 echo "      Namespace criado"
 
@@ -103,7 +103,7 @@ spec:
   nodeName: $TARGET_NODE
   restartPolicy: Never
   imagePullSecrets:
-  - name: gitlab-registry
+  - name: gitea-registry
   containers:
   - name: postgres
     image: $ESTARGZ_IMAGE