feat(hub): enrich AI coach with fund history, closed trades, and chat uploads

- Add 15-day fund snapshot store and /api/hub/account on all instances

- Summary includes yesterday/today trades, fund columns, and section 5 操作建议

- Chat context distinguishes empty positions from local monitors

- Support image/document attachments in AI chat

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

crypto_monitor_gate_bot/app.py

@@ -8127,6 +8127,19 @@ def _hub_meta_bundle():
     }
 
 
+def _hub_account_bundle():
+    funding_capital, trading_capital = get_exchange_capitals(force=True)
+    funding_usdt = round(funding_capital, 2) if funding_capital is not None else None
+    trading_usdt = round(trading_capital, 2) 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, 2) if available is not None else None,
+        "trading_day": get_trading_day(app_now()),
+    }
+
+
 def _hub_fetch_ohlcv(symbol, timeframe, since_ms=None, limit=500):
     from hub_ohlcv_lib import fetch_ohlcv_for_hub
 
@@ -8160,6 +8173,7 @@ try:
         get_db=get_db,
         row_to_dict=row_to_dict,
         meta_fn=_hub_meta_bundle,
+        account_fn=_hub_account_bundle,
         views={
             "add_order": add_order,
             "add_key": add_key,