feat(k8s): M5 Deployment 暂停更新 + CI/CD 集成

- 后端: PauseDeployment/ResumeDeployment 客户端方法 (PATCH spec.paused)
- 后端: ID路由 + Kuboard code路由 pause/resume handlers
- 后端: Deployment 列表 summary 增加 paused 字段
- 前端: 操作菜单增加「暂停更新/恢复更新」动态切换 + 暂停 Badge
- 前端: CI/CD 发布按钮跳转流水线页面 (namespace+deployment 上下文)
- 前端: api.ts 增加 pauseDeployment/resumeDeployment 方法
- 验证: 5项端到端测试全部通过 (Python urllib)

backend/pkg/kubernetesclient/client.go

@@ -291,6 +291,7 @@ type DeploymentItem struct {
 type DeploymentSpec struct {
 	Replicas int                `json:"replicas"`
 	Template DeploymentTemplate `json:"template"`
+	Paused   bool               `json:"paused"`
 }
 
 type DeploymentTemplate struct {
@@ -586,6 +587,26 @@ func (c *Client) RestartDeployment(namespace, name string) error {
 	return c.patch(path, body, nil)
 }
 
+// PauseDeployment pauses rollout of a Deployment by setting spec.paused=true.
+// A paused Deployment will not process new rollouts — useful for debugging or
+// staged updates. Resume with ResumeDeployment.
+func (c *Client) PauseDeployment(namespace, name string) error {
+	body := map[string]interface{}{
+		"spec": map[string]interface{}{"paused": true},
+	}
+	path := fmt.Sprintf("/apis/apps/v1/namespaces/%s/deployments/%s", namespace, name)
+	return c.patch(path, body, nil)
+}
+
+// ResumeDeployment resumes rollout of a paused Deployment by setting spec.paused=false.
+func (c *Client) ResumeDeployment(namespace, name string) error {
+	body := map[string]interface{}{
+		"spec": map[string]interface{}{"paused": false},
+	}
+	path := fmt.Sprintf("/apis/apps/v1/namespaces/%s/deployments/%s", namespace, name)
+	return c.patch(path, body, nil)
+}
+
 // --- Exec (K8s WebSocket channel protocol) ---
 
 // ExecResult holds the output of a pod exec command