fix: skip dbinit job when using external DB

When mysql.enabled=false (external DB), data already exists.
Running migrations would be destructive, so dbinit now only
runs when internal MySQL subchart is enabled.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hades/templates/job-dbinit.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.dbInit.enabled }}
+{{- if and .Values.dbInit.enabled (eq (printf "%v" .Values.mysql.enabled) "true") }}
 apiVersion: batch/v1
 kind: Job
 metadata: