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/_helpers.tpl

@@ -0,0 +1,40 @@
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "web-app.name" -}}
+{{- default .Chart.Name .Values.name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+*/}}
+{{- define "web-app.fullname" -}}
+{{- if .Values.name }}
+{{- .Values.name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "web-app.labels" -}}
+app: {{ include "web-app.fullname" . }}
+app.kubernetes.io/name: {{ include "web-app.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "web-app.selectorLabels" -}}
+app: {{ include "web-app.fullname" . }}
+{{- end }}
+
+{{/*
+Image name
+*/}}
+{{- define "web-app.image" -}}
+{{- printf "%s/%s:%s" .Values.image.registry .Values.image.repository .Values.image.tag }}
+{{- end }}