fix(helm): namespace app-specific global values under global.seaweedfs (#8700)

* fix(helm): namespace app-specific values under global.seaweedfs

Move all app-specific values from the global namespace to
global.seaweedfs.* to avoid polluting the shared .Values.global
namespace when the chart is used as a subchart.

Standard Helm conventions (global.imageRegistry, global.imagePullSecrets)
remain at the global level as they are designed to be shared across
subcharts.

Fixes seaweedfs/seaweedfs#8699

BREAKING CHANGE: global values have been restructured. Users must update
their values files to use the new paths:
- global.registry → global.imageRegistry
- global.repository → global.seaweedfs.image.repository
- global.imageName → global.seaweedfs.image.name
- global.<key> → global.seaweedfs.<key> (for all other app-specific values)

* fix(ci): update helm CI tests to use new global.seaweedfs.* value paths

Update all --set flags in helm_ci.yml to use the new namespaced
global.seaweedfs.* paths matching the values.yaml restructuring.

* fix(ci): install Claude Code via npm to avoid install.sh 403

The claude-code-action's built-in installer uses
`curl https://claude.ai/install.sh | bash` which can fail with 403.
Due to the pipe, bash exits 0 on empty input, masking the curl failure
and leaving the `claude` binary missing.

Work around this by installing Claude Code via npm before invoking the
action, and passing the executable path via path_to_claude_code_executable.

* revert: remove claude-code-review.yml changes from this PR

The claude-code-action OIDC token exchange validates that the workflow
file matches the version on the default branch. Modifying it in a PR
causes the review job to fail with "Workflow validation failed".

The Claude Code install fix will need to be applied directly to master
or in a separate PR.

* fix: update stale references to old global.* value paths

- admin-statefulset.yaml: fix fail message to reference
  global.seaweedfs.masterServer
- values.yaml: fix comment to reference image.name instead of imageName
- helm_ci.yml: fix diagnostic message to reference
  global.seaweedfs.enableSecurity

* feat(helm): add backward-compat shim for old global.* value paths

Add _compat.tpl with a seaweedfs.compat helper that detects old-style
global.* keys (e.g. global.enableSecurity, global.registry) and merges
them into the new global.seaweedfs.* namespace.

Since the old keys no longer have defaults in values.yaml, their
presence means the user explicitly provided them. The helper uses
in-place mutation via `set` so all templates see the merged values.

This ensures existing deployments using old value paths continue to
work without changes after upgrading.

* fix: update stale comment references in values.yaml

Update comments referencing global.enableSecurity and global.masterServer
to the new global.seaweedfs.* paths.

---------

Co-authored-by: Copilot <copilot@github.com>

k8s/charts/seaweedfs/templates/shared/post-install-bucket-hook.yaml

@@ -1,10 +1,11 @@
+{{- include "seaweedfs.compat" . -}}
 {{- /* Support bucket creation for both standalone filer.s3 and allInOne modes */}}
 {{- $createBuckets := list }}
 {{- $s3Enabled := false }}
 {{- $enableAuth := false }}
 {{- $existingConfigSecret := "" }}
 {{- $bucketsFolder := "/buckets" }}
-{{- $bucketEnvVars := merge (dict) (.Values.global.extraEnvironmentVars | default dict) }}
+{{- $bucketEnvVars := merge (dict) (.Values.global.seaweedfs.extraEnvironmentVars | default dict) }}
 {{- if .Values.allInOne.enabled }}
   {{- $bucketEnvVars = merge (.Values.allInOne.extraEnvironmentVars | default dict) $bucketEnvVars }}
 {{- else }}
@@ -68,7 +69,7 @@ spec:
       containers:
       - name: post-install-job
         image: {{ template "master.image" . }}
-        imagePullPolicy: {{ $.Values.global.imagePullPolicy | default "IfNotPresent" }}
+        imagePullPolicy: {{ $.Values.global.seaweedfs.imagePullPolicy | default "IfNotPresent" }}
         env:
           - name: WEED_CLUSTER_DEFAULT
             value: "sw"
@@ -183,7 +184,7 @@ spec:
         ports:
           - containerPort: {{ .Values.master.port }}
             name: swfs-master
-          {{- if and .Values.global.monitoring.enabled .Values.master.metricsPort }}
+          {{- if and .Values.global.seaweedfs.monitoring.enabled .Values.master.metricsPort }}
           - containerPort: {{ .Values.master.metricsPort }}
             name: metrics
           {{- end }}