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/static/icons/manifest.webmanifest

@@ -1,23 +1,23 @@
-{
-  "name": "复盘系统中控",
-  "short_name": "中控",
-  "description": "四所交易监控与行情中控",
-  "start_url": "/monitor",
-  "display": "standalone",
-  "background_color": "#0b0e18",
-  "theme_color": "#0b0e18",
-  "icons": [
-    {
-      "src": "/assets/icons/icon-192.png",
-      "sizes": "192x192",
-      "type": "image/png",
-      "purpose": "any"
-    },
-    {
-      "src": "/assets/icons/icon-512.png",
-      "sizes": "512x512",
-      "type": "image/png",
-      "purpose": "any maskable"
-    }
-  ]
-}
+{
+  "name": "复盘系统中控",
+  "short_name": "中控",
+  "description": "三所交易监控与行情中控",
+  "start_url": "/monitor",
+  "display": "standalone",
+  "background_color": "#0b0e18",
+  "theme_color": "#0b0e18",
+  "icons": [
+    {
+      "src": "/assets/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/assets/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}