fix: use SSH mode to install cmd agent + node

.gitea/workflows/install-cmd-agent.yml

@@ -1,31 +1,24 @@
-name: Install CMD Agent + Node.js on New Server
+name: Install CMD Agent + Node.js on New Server (via SSH)
 
 on:
   workflow_dispatch:
   push:
     branches:
       - ops/downgrade-runners
+    paths:
+      - '.gitea/workflows/install-cmd-agent.yml'
+      - 'scripts/install_cmd_agent.py'
 
 jobs:
   install:
     runs-on: saas
     steps:
-      - name: Download code
+      - name: Install CMD Agent + Node.js via SSH
         shell: sh
         run: |
           set -eu
-          archive_url="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
-          mkdir -p repo
-          curl -sL -H "Authorization: token ${GITHUB_TOKEN}" -o /tmp/repo.tar.gz "$archive_url"
-          tar -xzf /tmp/repo.tar.gz --strip-components=1 -C repo
-          rm -f /tmp/repo.tar.gz
-          cd repo
-          echo "代码下载完成，文件列表："
-          ls scripts/ | head -20
-
-      - name: Install CMD Agent + Node.js
-        shell: sh
-        run: |
-          set -eu
-          cd repo
-          python3 scripts/install_cmd_agent.py
+          # 下载脚本
+          curl -sL -H "Authorization: token ${GITHUB_TOKEN}" \
+            "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/contents/scripts/install_cmd_agent.py?ref=ops/downgrade-runners" \
+            | python3 -c "import json,sys,base64; d=json.load(sys.stdin); open('/tmp/install.py','w').write(base64.b64decode(d['content']).decode())"
+          python3 /tmp/install.py