feat: archive trades by close time and show open time on live positions

Sort inner-archive daily trades by closed_at_ms; add open time and live hold duration to instance and hub position cards, with exchange margin on hub footer.

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

crypto_monitor_gate_bot/app.py

@@ -7172,6 +7172,9 @@ def api_price_snapshot():
             symbol=r["symbol"],
         )
         apply_time_close_to_payload(payload, r)
+        payload["opened_at"] = r["opened_at"] if "opened_at" in r.keys() else None
+        open_ms = r["opened_at_ms"] if "opened_at_ms" in r.keys() else None
+        payload["opened_at_ms"] = int(open_ms) if open_ms not in (None, "") else None
         new_sl, new_tp, changed = order_monitor_tpsl_needs_sync(
             r["stop_loss"], r["take_profit"], exchange_tpsl
         )