Fix adguardhome PVC mount shadowing the binary

Mounting the whole PVC at /opt/adguardhome hid the AdGuardHome binary
that ships inside the image at that exact path, crash-looping the pod
(exec: /opt/adguardhome/AdGuardHome: no such file or directory). Use
subPath mounts for work/ and conf/ instead, same as the original split
hostPath layout, just backed by one PVC now.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01566weDFku8TaRC2CJUPVM1

adguardhome/templates/deployment.yaml

@@ -46,8 +46,15 @@ spec:
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
           volumeMounts:
+            # subPath mounts, not the whole /opt/adguardhome -- the AdGuardHome
+            # binary itself ships inside the image at /opt/adguardhome/AdGuardHome,
+            # so mounting the entire parent directory shadows it.
             - name: data
-              mountPath: /opt/adguardhome
+              mountPath: /opt/adguardhome/work
+              subPath: work
+            - name: data
+              mountPath: /opt/adguardhome/conf
+              subPath: conf
       volumes:
         - name: data
           persistentVolumeClaim: