Initial commit: Add demo nginx application

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

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+# Demo Application
+
+这是一个由ArgoCD管理的示例应用。
+
+## 应用信息
+- **应用名称**: demo-nginx
+- **镜像**: nginx:1.25-alpine
+- **副本数**: 2
+- **访问端口**: NodePort 30080
+
+## 更新应用
+修改 `manifests/` 目录下的文件并提交到Git，ArgoCD会自动同步部署。
+
+## 测试访问
+```bash
+curl http://<NODE_IP>:30080
+```

manifests/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: demo-nginx
+  namespace: default
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: demo-nginx
+  template:
+    metadata:
+      labels:
+        app: demo-nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.25-alpine
+        ports:
+        - containerPort: 80
+        resources:
+          requests:
+            memory: "64Mi"
+            cpu: "100m"
+          limits:
+            memory: "128Mi"
+            cpu: "200m"

manifests/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: demo-nginx
+  namespace: default
+spec:
+  type: NodePort
+  selector:
+    app: demo-nginx
+  ports:
+  - port: 80
+    targetPort: 80
+    nodePort: 30080