fix: isort import排序

- 集成测试从Validate拆出为独立Integration Tests job，PR页面可见独立状态
- runner标签从ubuntu-22.04改为host（适配当前runner配置）
- 清理废workflow: tests.yml / test-ssh-secret.yml / auto-merge.yml
- Verify步骤python命令改为python3

.gitea/workflows/temp-runner-expand.yml

@@ -1,164 +0,0 @@
-name: Runner Expand
-on: push
-
-jobs:
-  expand:
-    runs-on: host
-    steps:
-      - name: Expand to 3 runner instances
-        run: |
-          set +e
-          
-          echo "========== Step 1: 检查当前runner =========="
-          echo "当前进程数: $(ps aux | grep 'act_runner daemon' | grep -v grep | wc -l)"
-          
-          echo ""
-          echo "========== Step 2: 创建 runner-2 =========="
-          if [ -f /var/lib/xiaoxia-ci-runner-2/.runner ]; then
-            echo "runner-2 已注册，跳过"
-          else
-            mkdir -p /var/lib/xiaoxia-ci-runner-2
-            cp /var/lib/xiaoxia-ci/act_runner /var/lib/xiaoxia-ci-runner-2/act_runner
-            chmod +x /var/lib/xiaoxia-ci-runner-2/act_runner
-            
-            cat > /var/lib/xiaoxia-ci-runner-2/.runner-config.yaml << 'CFG'
-log:
-  level: info
-runner:
-  file: .runner
-  capacity: 1
-  timeout: 3h
-  insecure: false
-  fetch_timeout: 5s
-  fetch_interval: 2s
-  labels:
-    - runtime-builder
-    - ubuntu-latest
-    - host
-cache:
-  enabled: true
-  dir: /var/lib/xiaoxia-ci-runner-2/cache
-host:
-  workdir_parent: /var/lib/xiaoxia-ci-runner-2/workspace
-container:
-  network: host
-CFG
-            
-            REG_TOKEN=$(python3 -c "import json; print(json.load(open('/var/lib/xiaoxia-ci/.runner'))['token'])" 2>/dev/null)
-            REG_ADDR=$(python3 -c "import json; print(json.load(open('/var/lib/xiaoxia-ci/.runner'))['address'])" 2>/dev/null)
-            echo "使用注册地址: $REG_ADDR"
-            
-            cd /var/lib/xiaoxia-ci-runner-2
-            ./act_runner register \
-              --instance "$REG_ADDR" \
-              --token "$REG_TOKEN" \
-              --name "xiaoxia-ci-runner-2" \
-              --labels "runtime-builder:host,ubuntu-latest:host,host:host" \
-              --no-interactive 2>&1
-            echo "runner-2 注册结果: $?"
-          fi
-          
-          echo ""
-          echo "========== Step 3: 创建 runner-3 =========="
-          if [ -f /var/lib/xiaoxia-ci-runner-3/.runner ]; then
-            echo "runner-3 已注册，跳过"
-          else
-            mkdir -p /var/lib/xiaoxia-ci-runner-3
-            cp /var/lib/xiaoxia-ci/act_runner /var/lib/xiaoxia-ci-runner-3/act_runner
-            chmod +x /var/lib/xiaoxia-ci-runner-3/act_runner
-            
-            cat > /var/lib/xiaoxia-ci-runner-3/.runner-config.yaml << 'CFG'
-log:
-  level: info
-runner:
-  file: .runner
-  capacity: 1
-  timeout: 3h
-  insecure: false
-  fetch_timeout: 5s
-  fetch_interval: 2s
-  labels:
-    - runtime-builder
-    - ubuntu-latest
-    - host
-cache:
-  enabled: true
-  dir: /var/lib/xiaoxia-ci-runner-3/cache
-host:
-  workdir_parent: /var/lib/xiaoxia-ci-runner-3/workspace
-container:
-  network: host
-CFG
-            
-            REG_TOKEN=$(python3 -c "import json; print(json.load(open('/var/lib/xiaoxia-ci/.runner'))['token'])" 2>/dev/null)
-            REG_ADDR=$(python3 -c "import json; print(json.load(open('/var/lib/xiaoxia-ci/.runner'))['address'])" 2>/dev/null)
-            
-            cd /var/lib/xiaoxia-ci-runner-3
-            ./act_runner register \
-              --instance "$REG_ADDR" \
-              --token "$REG_TOKEN" \
-              --name "xiaoxia-ci-runner-3" \
-              --labels "runtime-builder:host,ubuntu-latest:host,host:host" \
-              --no-interactive 2>&1
-            echo "runner-3 注册结果: $?"
-          fi
-          
-          echo ""
-          echo "========== Step 4: systemd 服务 =========="
-          cat > /etc/systemd/system/act_runner-2.service << 'SVC'
-[Unit]
-Description=Gitea Actions Runner 2
-After=gitea.service network.target
-[Service]
-Type=simple
-WorkingDirectory=/var/lib/xiaoxia-ci-runner-2
-ExecStart=/var/lib/xiaoxia-ci-runner-2/act_runner daemon --config .runner-config.yaml
-Restart=always
-RestartSec=5s
-User=root
-[Install]
-WantedBy=multi-user.target
-SVC
-          
-          cat > /etc/systemd/system/act_runner-3.service << 'SVC'
-[Unit]
-Description=Gitea Actions Runner 3
-After=gitea.service network.target
-[Service]
-Type=simple
-WorkingDirectory=/var/lib/xiaoxia-ci-runner-3
-ExecStart=/var/lib/xiaoxia-ci-runner-3/act_runner daemon --config .runner-config.yaml
-Restart=always
-RestartSec=5s
-User=root
-[Install]
-WantedBy=multi-user.target
-SVC
-          
-          systemctl daemon-reload
-          systemctl enable act_runner-2.service act_runner-3.service 2>&1
-          systemctl start act_runner-2.service 2>&1
-          systemctl start act_runner-3.service 2>&1
-          sleep 8
-          
-          echo ""
-          echo "========== Step 5: 验证 =========="
-          COUNT=$(ps aux | grep 'act_runner daemon' | grep -v grep | wc -l)
-          echo "runner进程数: $COUNT"
-          ps aux | grep 'act_runner daemon' | grep -v grep
-          echo ""
-          echo "服务状态:"
-          systemctl is-active act_runner.service act_runner-2.service act_runner-3.service 2>&1
-          echo ""
-          echo "注册信息:"
-          for d in /var/lib/xiaoxia-ci /var/lib/xiaoxia-ci-runner-2 /var/lib/xiaoxia-ci-runner-3; do
-            if [ -f "$d/.runner" ]; then
-              python3 -c "
-import json
-d = json.load(open('$d/.runner'))
-print(f'  {d[\"name\"]}: id={d[\"id\"]}')
-" 2>/dev/null
-            fi
-          done
-          echo ""
-          echo "========== DONE =========="