feat(k8s): add defaults/main.yml, meta/main.yml for all 27 roles + 4 helm templates

- Added defaults/main.yml with production-ready values for all 27 Ansible roles
- Added meta/main.yml with role dependencies (DAG: prereq → namespaces → storage → traefik → cert-manager → services)
- Created 4 missing Helm templates: flink-deployment, kafka-cluster, smartapp-web, smartapp-api
- Fixed YAML syntax error in backup/tasks/main.yml (Velero backupStorageLocation)
- Updated README with domain list, dependencies diagram, and corrected Helm chart names
- All 81 YAML files pass validation

helms/roles/cert-manager/defaults/main.yml

@@ -0,0 +1,6 @@
+---
+# Role: cert-manager
+# Valeurs par défaut pour cert-manager
+
+# Email pour les certificats Let's Encrypt
+acme_email: "admin@digitribe.fr"

helms/roles/cert-manager/meta/main.yml

@@ -0,0 +1,12 @@
+---
+galaxy_info:
+  author: Eric FELIXINE
+  description: Deploy cert-manager for automated TLS certificate management on Kubernetes
+  license: MIT
+  min_ansible_version: "2.15"
+  platforms:
+    - name: Kubernetes
+      versions:
+        - "1.28"
+dependencies:
+  - role: traefik