refactor: move Helm chart to standard directory structure

This commit restructures the paperless-ai Helm chart by moving all files
 from the nested directory (charts/paperless-ai/paperless-ai/) to the
 standard Helm chart directory structure (charts/paperless-ai/). The change
 eliminates the redundant directory nesting that was causing issues with
 Helm chart packaging and installation. No functional changes were made to
 any files - this is purely a directory structure reorganization to follow
 Helm best practices and improve chart maintainability.

charts/paperless-ai/templates/dataPvc.yaml

@@ -0,0 +1,15 @@
+{{- if .Values.persistence.data.enabled }}
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "paperless-ai.fullname" . }}-pvc-data
+  labels:
+    {{- include "paperless-ai.labels" . | nindent 4 }}
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: {{ .Values.persistence.data.size }}
+  storageClassName: {{ .Values.persistence.data.storageClass }}
+{{- end }}