fix: kubectl 自动安装兜底 + 阿里云镜像源

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yaml

@@ -68,7 +68,12 @@ jobs:
           docker push ${{ env.CR_SERVER_ACTIVE }}/${{ env.CR_ORG }}/video-web:latest
 
       - name: Setup Kubectl
-        run: kubectl version --client
+        run: |
+          if ! command -v kubectl &>/dev/null; then
+            curl -LO "https://mirrors.aliyun.com/kubernetes/kubectl/v1.28.0/bin/linux/amd64/kubectl"
+            chmod +x kubectl && mv kubectl /usr/local/bin/
+          fi
+          kubectl version --client
 
       - name: Set kubeconfig
         run: |