feat: migrate CSI drivers to dedicated storage project (#45)

- 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

Reviewed-on: #45

argocd/applicationsets/storage.yaml

@@ -0,0 +1,29 @@
+---
+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: storage-apps
+  namespace: argocd
+spec:
+  generators:
+  - git:
+      repoURL: https://git.unkin.net/unkin/argocd-apps
+      revision: HEAD
+      directories:
+      - path: apps/overlays/*/csi-*
+  template:
+    metadata:
+      name: 'storage-{{path[3]}}'  # cluster-app format (e.g., storage-csi-cephfs)
+    spec:
+      project: storage
+      source:
+        repoURL: https://git.unkin.net/unkin/argocd-apps
+        targetRevision: HEAD
+        path: '{{path}}'
+      destination:
+        server: https://kubernetes.default.svc
+        namespace: '{{path[3]}}'  # Use directory name as namespace
+      syncPolicy:
+        automated:
+          prune: true
+          selfHeal: true