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

aula-08/cluster-autoscaler.yaml

@@ -1,6 +1,10 @@
 ############################################################
 # Cluster Autoscaler para Hetzner Cloud + Talos
-# Escala workers automaticamente de 1 a 5 nodes
+#
+# Pools:
+# - worker-pool: CAX21 (4 vCPU, 8GB) - workloads gerais
+# - gitlab-pool: CAX21 - GitLab e serviços relacionados
+# - build-pool: CAX31 (8 vCPU, 16GB) - builds Docker, escala 0-1
 ############################################################
 
 ---
@@ -120,15 +124,29 @@ spec:
           command:
             - ./cluster-autoscaler
             - --cloud-provider=hetzner
-            - --nodes=0:5:CAX11:nbg1:worker-pool
-            - --nodes=0:0:CAX11:nbg1:draining-node-pool
+            #
+            # POOLS DE NODES:
+            #
+            # worker-pool: Workloads gerais (CAX21 = 4 vCPU, 8GB)
+            - --nodes=1:3:CAX21:nbg1:worker-pool
+            #
+            # gitlab-pool: GitLab e serviços pesados (CAX21)
+            - --nodes=1:2:CAX21:nbg1:gitlab-pool
+            #
+            # build-pool: Builds Docker (CAX31 = 8 vCPU, 16GB)
+            # Escala 0-1 sob demanda, taint "dedicated=builds:NoSchedule"
+            - --nodes=0:1:CAX31:nbg1:build-pool
+            #
+            # CONFIGURAÇÕES DE SCALE DOWN:
+            #
             - --scale-down-enabled=true
-            - --scale-down-delay-after-add=5m
+            - --scale-down-delay-after-add=3m
             - --scale-down-unneeded-time=3m
             - --scale-down-utilization-threshold=0.5
             - --skip-nodes-with-local-storage=false
             - --skip-nodes-with-system-pods=false
-            - --balance-similar-node-groups=true
+            - --balance-similar-node-groups=false
+            - --expander=least-waste
             - --v=4
           env:
             - name: HCLOUD_TOKEN
@@ -141,6 +159,11 @@ spec:
                 secretKeyRef:
                   name: hcloud-autoscaler
                   key: cloud-init
+            - name: HCLOUD_CLUSTER_CONFIG
+              valueFrom:
+                secretKeyRef:
+                  name: hcloud-autoscaler
+                  key: cluster-config
             - name: HCLOUD_IMAGE
               value: "${TALOS_IMAGE_ID}"
             - name: HCLOUD_NETWORK