Shorten force-close window to 5m and grey-out open during blocks.

Unify Gate/OKX/Binance: disable the open button with a side note during force-close, cooloff, and daily freeze, and enforce the same gate server-side.

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

lib/env/env_schema.py

@@ -76,6 +76,7 @@ HOT_RELOAD_EXACT = frozenset({
     "TRANSFER_CCY",
     "FORCE_CLOSE_ENABLED",
     "FORCE_CLOSE_BJ_HOUR",
+    "FORCE_CLOSE_GRACE_MINUTES",
     "BTC_LEVERAGE",
     "ALT_LEVERAGE",
     "DAILY_START_CAPITAL",

lib/env/env_ui_manifest.py

@@ -83,6 +83,7 @@ _SHARED_SECTIONS: list[dict[str, Any]] = [
             ("KEY_AUTO_MIN_PLANNED_RR", "关键位最低盈亏比", "自动单计划 RR 须严格大于该值,默认 1.5"),
             ("FORCE_CLOSE_ENABLED", "强制清仓开关", ""),
             ("FORCE_CLOSE_BJ_HOUR", "强制清仓整点(北京)", ""),
+            ("FORCE_CLOSE_GRACE_MINUTES", "强制清仓窗口(分钟)", "默认 5;整点起该分钟内执行并禁止开仓"),
         ],
     },
     {