REFACTOR(repo): migrate to Helm chart structure

- Add web-app Helm chart in charts/web-app/
- Replace individual deployment/service/ingress YAML with helm-values
- Update ArgoCD applications to use Helm chart with values files
- Reduces per-app files from 6 to 2 (argocd.yaml + helm-values.yaml)

Apps migrated: jaejadle, jaejadle-dev, joossam, joossam-dev,
jotion, jovies, portfolio, todo

charts/web-app/templates/external-secret.yaml

@@ -0,0 +1,22 @@
+{{- if .Values.externalSecret.enabled }}
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: {{ include "web-app.fullname" . }}-secrets
+spec:
+  refreshInterval: {{ .Values.externalSecret.refreshInterval }}
+  secretStoreRef:
+    name: {{ .Values.externalSecret.secretStoreRef.name }}
+    kind: {{ .Values.externalSecret.secretStoreRef.kind }}
+  target:
+    name: {{ include "web-app.fullname" . }}-secrets
+    creationPolicy: {{ .Values.externalSecret.target.creationPolicy }}
+    deletionPolicy: {{ .Values.externalSecret.target.deletionPolicy }}
+  data:
+    {{- range .Values.externalSecret.data }}
+    - secretKey: {{ .secretKey }}
+      remoteRef:
+        key: {{ .remoteRef.key }}
+        property: {{ .remoteRef.property }}
+    {{- end }}
+{{- end }}