Align hedge-plan perp contract precision with exchange and show TP/SL USDT PnL.

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

lib/hedge_plan/hedge_plan_register.py

@@ -10,10 +10,12 @@ from jinja2 import ChoiceLoader, FileSystemLoader
 from lib.hedge_plan.hedge_plan_calc_lib import (
     build_options_options_preview,
     build_perp_options_preview,
+    floor_contracts_to_precision,
     gate_status,
     option_premium_total,
     suggest_contracts_from_notional,
 )
+from lib.hub.hub_calculator_market_lib import amount_decimals_from_exchange
 from lib.trade.position_sizing_lib import (
     compute_full_margin_sizing,
     load_position_sizing_mode,
@@ -305,6 +307,11 @@ def _fetch_perp_market(cfg: dict[str, Any], base: str) -> tuple[dict[str, Any],
     entry = float(mark or last or 0)
     sizing = None
     suggest_contracts = None
+    amount_precision = 4
+    try:
+        amount_precision = int(amount_decimals_from_exchange(ex, sym))
+    except Exception:
+        amount_precision = 4
     if available is not None and entry > 0:
         sizing, _serr = compute_full_margin_sizing(
             symbol=sym,
@@ -316,11 +323,20 @@ def _fetch_perp_market(cfg: dict[str, Any], base: str) -> tuple[dict[str, Any],
             funds_decimals=int(cfg.get("funds_decimals") or 2),
         )
         if sizing:
-            suggest_contracts = suggest_contracts_from_notional(
+            raw_contracts = suggest_contracts_from_notional(
                 notional=float(sizing["notional_value"]),
                 entry=entry,
                 contract_size=cs,
             )
+            # 优先走交易所 amount_to_precision;失败则按精度位数向下取整
+            suggest_contracts = None
+            try:
+                precise = float(ex.amount_to_precision(sym, raw_contracts))
+                if precise > raw_contracts + 1e-12:
+                    precise = floor_contracts_to_precision(raw_contracts, amount_precision)
+                suggest_contracts = precise
+            except Exception:
+                suggest_contracts = floor_contracts_to_precision(raw_contracts, amount_precision)
 
     return {
         "exchange_symbol": sym,
@@ -331,7 +347,11 @@ def _fetch_perp_market(cfg: dict[str, Any], base: str) -> tuple[dict[str, Any],
         "contract_size": cs,
         "available_usdt": available,
         "full_margin_sizing": sizing,
-        "suggest_contracts": round(suggest_contracts, 6) if suggest_contracts is not None else None,
+        "suggest_contracts": suggest_contracts,
+        "amount_precision": amount_precision,
+        "unit_quote": "USDT",
+        "unit_contracts": "合约张",
+        "unit_note": "价格单位 USDT;张数=交易所永续合约张(与下单精度一致);名义≈张数×面值×价格",
         "entry_ref": entry or None,
     }, None