feat: initial tictactoe web app with CI/CD pipeline

- Express app serving vanilla JS 2-player TicTacToe game
- Dockerfile (multi-stage node:18-slim)
- Jenkinsfile (K8s pod: test → Harbor push → Helm bump → Gitea push)
- Helm chart v1.0.0 with HTTPRoute for tictactoe.fireflylab.local

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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