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-13/k8s/prepull-daemonset.yaml

@@ -0,0 +1,131 @@
+# =============================================================================
+# Pre-pull DaemonSet - Alternativa para Cold Start
+# =============================================================================
+# Garante que imagens críticas estejam em cache em TODOS os nodes.
+# Quando KEDA/Cluster Autoscaler criar pods, imagens já estarão disponíveis.
+# =============================================================================
+#
+# COMO USAR:
+# 1. Edite a lista de initContainers com suas imagens
+# 2. kubectl apply -f prepull-daemonset.yaml
+# 3. Aguarde todos os pods ficarem Ready
+# 4. Imagens estarão em cache em todos os nodes
+#
+# QUANDO USAR:
+# - Databases (PostgreSQL, MongoDB) que precisam de 100% dos arquivos
+# - Apps que precarregam (n8n, Laravel Octane)
+# - Qualquer imagem onde eStargz NÃO ajuda
+#
+# =============================================================================
+
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: image-prepuller
+  namespace: kube-system
+  labels:
+    app: image-prepuller
+    purpose: cold-start-optimization
+spec:
+  selector:
+    matchLabels:
+      app: image-prepuller
+  template:
+    metadata:
+      labels:
+        app: image-prepuller
+    spec:
+      # Tolera todos os taints para rodar em TODOS os nodes
+      tolerations:
+        - operator: Exists
+
+      # InitContainers baixam as imagens e terminam
+      initContainers:
+        # ---------------------------------------------------------------------
+        # PostgreSQL (Container Factory)
+        # ---------------------------------------------------------------------
+        - name: prepull-postgresql
+          image: registry.kube.quest/factory/postgresql:17
+          command: ["echo", "PostgreSQL image cached"]
+          imagePullPolicy: Always
+          resources:
+            requests:
+              cpu: 1m
+              memory: 1Mi
+            limits:
+              cpu: 10m
+              memory: 10Mi
+
+        # ---------------------------------------------------------------------
+        # n8n
+        # ---------------------------------------------------------------------
+        - name: prepull-n8n
+          image: docker.n8n.io/n8nio/n8n:latest
+          command: ["echo", "n8n image cached"]
+          imagePullPolicy: Always
+          resources:
+            requests:
+              cpu: 1m
+              memory: 1Mi
+            limits:
+              cpu: 10m
+              memory: 10Mi
+
+        # ---------------------------------------------------------------------
+        # PostgreSQL Oficial (para clientes)
+        # ---------------------------------------------------------------------
+        - name: prepull-postgres-alpine
+          image: postgres:17-alpine
+          command: ["echo", "PostgreSQL Alpine image cached"]
+          imagePullPolicy: Always
+          resources:
+            requests:
+              cpu: 1m
+              memory: 1Mi
+            limits:
+              cpu: 10m
+              memory: 10Mi
+
+        # ---------------------------------------------------------------------
+        # Redis
+        # ---------------------------------------------------------------------
+        - name: prepull-redis
+          image: redis:7-alpine
+          command: ["echo", "Redis image cached"]
+          imagePullPolicy: Always
+          resources:
+            requests:
+              cpu: 1m
+              memory: 1Mi
+            limits:
+              cpu: 10m
+              memory: 10Mi
+
+      # Container principal apenas mantém o DaemonSet vivo
+      containers:
+        - name: pause
+          image: gcr.io/google_containers/pause:3.9
+          resources:
+            requests:
+              cpu: 1m
+              memory: 1Mi
+            limits:
+              cpu: 10m
+              memory: 10Mi
+
+      # Secrets para registries privados
+      imagePullSecrets:
+        - name: gitlab-registry
+
+---
+# =============================================================================
+# Secret para Registry Privado (template)
+# =============================================================================
+# Crie este secret em kube-system se usar registry privado:
+#
+# kubectl create secret docker-registry gitlab-registry \
+#   --namespace=kube-system \
+#   --docker-server=registry.kube.quest \
+#   --docker-username=<usuario> \
+#   --docker-password=<token>
+# =============================================================================