phase 7-8 完成 + warmup 修复 + 产物结构化重组

主要内容：
- Phase 8 PROMOTE: finalist #1 (trial #324) registry 条目，自动生成
- Optuna objective warmup bug 修复 (shared/optimizer/objective.py)
- studies/ 目录按用途重组为 optuna/ + finalists/ + features/ 三层
- reports/ 加入 Optuna 中文 dashboard (5 主图 + 18 slice + 15 contour)
- 新增 PROJECT_GUIDE.md 项目说明文档
- 新增 build_registry_entry.py / build_optuna_dashboard.py / build_feature_datasets.py
- .gitignore: 允许提交 studies/*.db (Optuna DB) 和 reports/*.html (MT5 + dashboard)

strategies/gold_scalper_pro/scalper_engine.py

@@ -198,7 +198,18 @@ class ScalperEngine:
 
                     sl = sl_prices[i] if not np.isnan(sl_prices[i]) else 0.0
                     tp = tp_prices[i] if not np.isnan(tp_prices[i]) else 0.0
-                    lots = self._calc_lots(cfg, instrument, sl, equity)
+                    # _calc_lots expects the SL *distance* (price units), not the
+                    # SL price level. signals.py sets sl_prices[i] = close[i] ±
+                    # sl_dist[i] (where sl_dist[i] = InpAtrSLMult × ATR[i]), so
+                    # |close[i] - sl_prices[i]| recovers exactly sl_dist[i] — the
+                    # same distance MT5 uses for sizing (it does NOT include the
+                    # gap between signal-bar close and next-bar fill). Using
+                    # fill_price here instead made sl_distance vary with the
+                    # open-gap, sometimes bigger, sometimes smaller than MT5's
+                    # value, which made lots inconsistent and the equity curve
+                    # diverge exponentially from MT5 under risk% compounding.
+                    sl_distance = abs(closes[i] - sl) if sl > 0 else 0.0
+                    lots = self._calc_lots(cfg, instrument, sl_distance, equity)
                     if lots > 0:
                         open_pos = Position(
                             direction=direction,