feat: migrate CSI drivers to dedicated storage project

- Migrate csi-cephfs from Terraform to ArgoCD
- Migrate csi-cephrbd from Terraform to ArgoCD
- Create dedicated storage project and ApplicationSet for CSI drivers
- Add csi-* pattern matching in storage ApplicationSet
- Remove CSI apps from platform project to separate concerns

apps/overlays/au-syd1/csi-cephfs/kustomization.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../../base/csi-cephfs
+
+helmCharts:
+  - name: ceph-csi-cephfs
+    repo: https://ceph.github.io/csi-charts
+    version: "3.15.0"
+    releaseName: ceph-csi-cephfs
+    namespace: csi-cephfs
+    valuesFile: values.yaml

apps/overlays/au-syd1/csi-cephfs/values.yaml

@@ -0,0 +1,41 @@
+csiConfig:
+  # raid6, 75% space efficiency
+  - clusterID: "cephfs_csi_ssd_ec_6_2"
+    monitors:
+      - "198.18.23.9:6789"
+      - "198.18.23.10:6789"
+      - "198.18.23.11:6789"
+      - "198.18.23.12:6789"
+      - "198.18.23.13:6789"
+    cephFS:
+      subvolumeGroup: csi_ssd_ec_6_2
+
+  # raid5, 80% space efficiency
+  - clusterID: "cephfs_csi_ssd_ec_4_1"
+    monitors:
+      - "198.18.23.9:6789"
+      - "198.18.23.10:6789"
+      - "198.18.23.11:6789"
+      - "198.18.23.12:6789"
+      - "198.18.23.13:6789"
+    cephFS:
+      subvolumeGroup: csi_ssd_ec_4_1
+
+# Secret containing Ceph credentials
+secret:
+  create: false
+  name: "csi-cephfs-secret"
+
+# Storage class configuration (disabled - managed separately when needed)
+storageClass:
+  create: false
+
+# Provisioner configuration
+provisioner:
+  name: csi-cephfs-provisioner
+  replicaCount: 3
+
+# Image versions
+image:
+  repository: quay.io/cephcsi/cephcsi
+  tag: v3.15.0