refactor: migrar GitLab → Gitea (aulas 10, 11, 13)

- Aula 10: Gitea + Registry + Actions + Runner (substituiu GitLab)
  - gitea-values.yaml: PostgreSQL standalone, Valkey standalone, ~800Mi RAM
  - setup.sh/cleanup.sh: namespace gitea, Helm gitea-charts/gitea + actions
  - README.md: documentação completa com de→para (GitLab/Harbor/Tekton vs Gitea)

- Aula 11: ArgoCD (GitOps) — removido GitLab Runner (runner vive na aula-10)
  - setup.sh: só ArgoCD, integração SSH com Gitea
  - node-bugado/.gitea/workflows/ci.yml: pipeline convertida

- Aula 13: Container Factory — atualizado para Gitea
  - setup.sh/cleanup.sh: referências GitLab → Gitea
  - pipelines/postgresql/ci.yml: Gitea Actions workflow
  - README.md: conexão com act_runner explicada

- CLAUDE.md: tabela de aulas atualizada

CLAUDE.md

@@ -20,8 +20,8 @@ App de demonstração: `node-bugado` - trava após N requests para demonstrar he
 | 07 | Talos Linux (snapshot Hetzner) | Hetzner |
 | 08 | Cluster HA (OpenTofu + CCM + CSI) | Hetzner |
 | 09 | n8n multi-tenant | Hetzner |
-| 10 | GitLab + Registry + SSH | Hetzner |
-| 11 | ArgoCD + GitLab Runner | Hetzner |
+| 10 | Gitea + Registry + SSH + Actions + Runner | Hetzner |
+| 11 | ArgoCD (GitOps) | Hetzner |
 | 12 | Victoria Metrics (Observabilidade) | Hetzner |
 | 13 | Container Factory (eStargz) | Hetzner |
 | 14 | Istio Traffic Splitting | Hetzner |
@@ -35,7 +35,7 @@ cd aula-XX && ./setup.sh      # ou kubectl apply -f .
 # Aulas 07-13 (Hetzner)
 cd aula-08 && ./setup.sh      # Cluster base
 cd aula-09 && ./setup.sh      # n8n
-cd aula-10 && ./setup.sh      # GitLab
+cd aula-10 && ./setup.sh      # Gitea
 cd aula-11 && ./setup.sh      # ArgoCD
 cd aula-12 && ./setup.sh      # Victoria Metrics
 cd aula-13 && ./setup.sh      # Container Factory