chore(helm): deploy SILO and mcli 20261109 by default

The 20261026 release moved mcImage.tag but left image.tag, which the
templates deploy, at 20260916 (#296). Point the server and mcli images
and appVersion at RELEASE.2026-11-09T00-00-00Z and bump the chart to
7.0.4.

The Helm check now reads the chart version instead of a fixed file name,
and fails when image.tag differs from appVersion, so a release cannot
move one without the other again.

Upgrades that pass --reuse-values keep the old image.tag; set image.tag
explicitly when upgrading such a release.

Fixes #296

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Feng Ruohang <rh@vonng.com>

helm/silo/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v1
 description: S3-Interface Libre Object Storage
 name: silo
-version: 7.0.3
-appVersion: RELEASE.2026-09-16T00-00-00Z
+version: 7.0.4
+appVersion: RELEASE.2026-11-09T00-00-00Z
 keywords:
   - silo
   - storage

helm/silo/values.yaml

@@ -15,7 +15,7 @@ clusterDomain: cluster.local
 ##
 image:
   repository: pgsty/silo
-  tag: RELEASE.2026-09-16T00-00-00Z
+  tag: RELEASE.2026-11-09T00-00-00Z
   pullPolicy: IfNotPresent
 
 imagePullSecrets: []
@@ -25,7 +25,7 @@ imagePullSecrets: []
 ##
 mcImage:
   repository: pgsty/mc
-  tag: RELEASE.2026-10-26T00-00-00Z
+  tag: RELEASE.2026-11-09T00-00-00Z
   pullPolicy: IfNotPresent
 
 ## Silo mode, i.e. standalone or distributed.