feat: 실시간 슬리피지 모니터링(UI/백엔드) 적용 및 Rust 엔진 포팅 Phase 1 셋업

kis_trader/web/feed_collect_stats.py

@@ -1426,9 +1426,29 @@ def _build_feed_collect_stats_inner(
             max_age_sec=max_age,
         ),
     ]
+    try:
+        slip_rows = db.conn.execute(
+            "SELECT avg_buy_price, target_price FROM active_trades WHERE buy_date >= %s",
+            (f"{day8[:4]}-{day8[4:6]}-{day8[6:8]} 00:00:00",)
+        ).fetchall()
+        slips = []
+        for r in slip_rows:
+            r = dict(r)
+            bp = float(r.get("avg_buy_price") or 0)
+            tp = float(r.get("target_price") or 0)
+            if tp > 0 and bp > 0:
+                slips.append((bp - tp) / tp * 100.0)
+        avg_slippage = round(sum(slips) / len(slips), 3) if slips else None
+        slippage_count = len(slips)
+    except Exception as e:
+        avg_slippage = None
+        slippage_count = 0
+
     vendor_matrix = {
         "day8": day8,
         "day": f"{day8[:4]}-{day8[4:6]}-{day8[6:8]}",
+        "avg_slippage_pct": avg_slippage,
+        "slippage_count": slippage_count,
         "vendors": [
             _pack_vendor(
                 "kis",