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/httproute.yaml

@@ -0,0 +1,19 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: {{ .Chart.Name }}
+  namespace: {{ .Release.Namespace }}
+spec:
+  parentRefs:
+  - name: envoy-gateway
+    namespace: envoy-gateway-system
+  hostnames:
+  - "tictactoe.fireflylab.local"
+  rules:
+  - matches:
+    - path:
+        type: PathPrefix
+        value: /
+    backendRefs:
+    - name: {{ .Chart.Name }}
+      port: {{ .Values.service.port }}