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>

deploy/setup_env.sh

@@ -3,7 +3,7 @@
 #
 # 用法:
 #   bash deploy/setup_env.sh
-#   bash deploy/setup_env.sh --only binance,gate_bot
+#   bash deploy/setup_env.sh --only binance,gate
 #   bash deploy/setup_env.sh --skip-pm2
 #   bash deploy/setup_env.sh --recreate-venv
 #   bash deploy/setup_env.sh --install-system-deps   # root + apt 时安装 python*-venv
@@ -244,7 +244,6 @@ ensure_venv_prereqs "${PY}"
 
 should_include binance && setup_monitor crypto_monitor_binance
 should_include gate && setup_monitor crypto_monitor_gate
-should_include gate_bot && setup_monitor crypto_monitor_gate_bot
 should_include okx && setup_monitor crypto_monitor_okx
 should_include hub && setup_hub