feat: initial commit — tcb_devportal Next.js app

Includes Helm chart (tcb-devportal), Jenkinsfile with homelab CI pipeline,
and Next.js app source.

manifest/helm/templates/service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: {{ .Chart.Name }}
+spec:
+  selector:
+    app: {{ .Chart.Name }}
+  ports:
+  - port: {{ .Values.service.port }}
+    targetPort: {{ .Values.service.targetPort }}
+    protocol: TCP