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/storage/defaults/main.yml

@@ -0,0 +1,10 @@
+---
+# Role: storage
+# Valeurs par défaut pour le stockage NFS
+
+# Classe de stockage par défaut
+storage_class: "nfs-client"
+
+# Serveur NFS
+nfs_server: "10.0.0.1"
+nfs_path: "/srv/nfs/k8s"

helms/roles/storage/meta/main.yml

@@ -0,0 +1,12 @@
+---
+galaxy_info:
+  author: Eric FELIXINE
+  description: Provision and manage persistent storage (PVs, PVCs, StorageClasses) on Kubernetes
+  license: MIT
+  min_ansible_version: "2.15"
+  platforms:
+    - name: Kubernetes
+      versions:
+        - "1.28"
+dependencies:
+  - role: namespaces