fix(hub): restore pre-WS quote path and relieve Gate/account contention

Two audit rounds after WS rollback: lighten hub options snapshot, cache hub balances without extra fetch_balance, soft-poll single-flight, and document fixes in R1/R2 reports.

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

crypto_monitor_binance/app.py

@@ -10042,14 +10042,14 @@ def _hub_meta_bundle():
 
 
 def _hub_account_bundle():
-    funding_capital, trading_capital = get_exchange_capitals(force=True)
+    # 中控看板高频拉取:仅走余额缓存,避免额外 fetch_balance
+    funding_capital, trading_capital = get_exchange_capitals(force=False)
     funding_usdt = round(funding_capital, FUNDS_DECIMALS) if funding_capital is not None else None
     trading_usdt = round(trading_capital, FUNDS_DECIMALS) if trading_capital is not None else None
-    available = get_available_trading_usdt()
     return {
         "funding_usdt": funding_usdt,
         "trading_usdt": trading_usdt,
-        "available_trading_usdt": round(available, FUNDS_DECIMALS) if available is not None else None,
+        "available_trading_usdt": trading_usdt,
         "trading_day": get_trading_day(app_now()),
     }