feat(k8s): 实时日志流 + WebSocket exec 交互终端 + 前端流式日志查看器

后端:
  - GetPodLogsStream: 新增 K8s follow=true 流式日志读取
  - GetPodLogs handler: 支持 stream=true → chunked transfer 实时推流
  - ExecTerminal: WebSocket → K8s SPDY exec 双向代理 (交互式 bash)
  - 路由: GET /ws/k8s-exec/:id/namespaces/:ns/pods/:pod (WebSocket)

前端 DeploymentDetail:
  - 新增「实时流」按钮: fetch ReadableStream + TextDecoder 逐块渲染
  - 日志内容自动滚动追加

CD/CI 镜像更新:
  - POST /update-image 已可用 (前端表单+后端 API 均完成)

frontend/src/components/k8s/DeploymentDetail.tsx

@@ -388,9 +388,38 @@ export function DeploymentDetail({ clusterId, namespace, deploymentName, onBack
                   <p>点击 Pod 列表中的「日志」按钮查看</p>
                 </div>
               ) : (
-                <pre className="bg-slate-950 rounded-lg p-4 text-xs text-slate-300 font-mono overflow-auto max-h-[500px] whitespace-pre-wrap">
-                  {logs || '无日志内容'}
-                </pre>
+                <div>
+                  <div className="flex items-center gap-2 mb-2">
+                    <Button variant="outline" size="sm" className="border-slate-700 text-slate-300 text-xs h-7"
+                      onClick={async () => {
+                        setLogs('');
+                        // Stream mode
+                        const token = localStorage.getItem('token') || '';
+                        const url = `${window.location.protocol}//${window.location.host}/api/v1/k8s-clusters/${clusterId}/namespaces/${namespace}/pods/${logPod}/logs?tail=${logTail}&stream=true`;
+                        try {
+                          const resp = await fetch(url, { headers: { Authorization: `Bearer ${token}` } });
+                          const reader = resp.body?.getReader();
+                          if (!reader) return;
+                          const decoder = new TextDecoder();
+                          let streamLogs = '';
+                          while (true) {
+                            const { done, value } = await reader.read();
+                            if (done) break;
+                            streamLogs += decoder.decode(value, { stream: true });
+                            setLogs(streamLogs);
+                          }
+                        } catch (e) {
+                          setLogs('流式连接中断');
+                        }
+                      }}>
+                      <RefreshCw className="h-3 w-3 mr-1" />实时流
+                    </Button>
+                    <span className="text-xs text-slate-500">{logPod}</span>
+                  </div>
+                  <pre className="bg-slate-950 rounded-lg p-4 text-xs text-slate-300 font-mono overflow-auto max-h-[500px] whitespace-pre-wrap">
+                    {logs || '无日志内容'}
+                  </pre>
+                </div>
               )}
             </CardContent>
           </Card>