refactor: 移除 gate_bot，统一为三所架构并更新文档

删除 crypto_monitor_gate_bot 目录，中控与子代理改为 binance/okx/gate 三账户；
文档与 UI 文案「四所」改为「三所」；新增清库前一次性配置备份脚本。

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/scripts/fix_env_crlf.sh

@@ -10,7 +10,6 @@ dirs=(
   "${REPO}/crypto_monitor_binance"
   "${REPO}/crypto_monitor_okx"
   "${REPO}/crypto_monitor_gate"
-  "${REPO}/crypto_monitor_gate_bot"
 )
 
 fixed=0
@@ -30,5 +29,5 @@ for d in "${dirs[@]}"; do
 done
 
 echo "完成，共修复 ${fixed} 个 .env。"
-echo "请重启子代理: cd ${REPO}/manual_trading_hub && pm2 restart manual-agent-gate manual-agent-gate-bot manual-agent-binance manual-agent-okx"
+echo "请重启子代理: cd ${REPO}/manual_trading_hub && pm2 restart manual-agent-gate manual-agent-binance manual-agent-okx"
 echo "或: bash scripts/pm2_hub.sh restart"