feat: 计仓改为固定手数/固定金额，推荐过滤与CTP保证金，下单与持仓UI优化

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

recommend_stream.py

@@ -62,6 +62,8 @@ def start_recommend_worker(
     init_tables_fn: Callable | None = None,
     get_mode_fn: Callable[[], str] | None = None,
     get_max_margin_pct_fn: Callable[[], float] | None = None,
+    get_sizing_mode_fn: Callable[[], str] | None = None,
+    get_fixed_lots_fn: Callable[[], int] | None = None,
     interval: int = CHECK_INTERVAL_SEC,
 ) -> None:
     """后台每日刷新推荐（每小时检查一次是否需更新），并推送给 SSE 订阅者。"""
@@ -83,7 +85,14 @@ def start_recommend_worker(
                         )
                         cached = load_recommend_cache(conn)
                         logger.info("品种推荐刷新完成，capital=%.2f rows=%d", capital, len(cached.get("rows") or []))
-                    payload = recommend_payload(conn, live_capital=capital, max_margin_pct=max_pct)
+                    payload = recommend_payload(
+                        conn,
+                        live_capital=capital,
+                        max_margin_pct=max_pct,
+                        trading_mode=mode,
+                        sizing_mode=get_sizing_mode_fn() if get_sizing_mode_fn else "fixed",
+                        fixed_lots=get_fixed_lots_fn() if get_fixed_lots_fn else 1,
+                    )
                 finally:
                     conn.close()
                 recommend_hub.broadcast("recommend", {"ok": True, **payload})