恢复下单界面并排布局，品种推荐数据库缓存与 SSE 推送。

期货下单与持仓监控左右并排，推荐按资金过滤存库，后台刷新并通过 EventSource 推送。

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

recommend_store.py

@@ -0,0 +1,66 @@
+"""品种推荐：计算、按资金过滤、SQLite 缓存。"""
+from __future__ import annotations
+
+import json
+from datetime import datetime
+from typing import Callable, Optional
+
+from product_recommend import list_product_recommendations
+
+RECOMMEND_CACHE_SQL = """
+CREATE TABLE IF NOT EXISTS product_recommend_cache (
+    id INTEGER PRIMARY KEY CHECK (id = 1),
+    capital REAL NOT NULL DEFAULT 0,
+    rows_json TEXT NOT NULL DEFAULT '[]',
+    updated_at TEXT
+)
+"""
+
+
+def ensure_recommend_tables(conn) -> None:
+    conn.execute(RECOMMEND_CACHE_SQL)
+
+
+def filter_affordable_recommendations(rows: list[dict]) -> list[dict]:
+    """仅保留当前资金可开 1 手的品种（不含资金不足、无行情）。"""
+    return [r for r in rows if r.get("status") in ("ok", "margin_ok")]
+
+
+def refresh_recommend_cache(
+    conn,
+    capital: float,
+    price_fn: Callable[[str], Optional[float]],
+) -> list[dict]:
+    """后台拉行情、筛选并写入数据库。"""
+    ensure_recommend_tables(conn)
+    all_rows = list_product_recommendations(capital, price_fn)
+    rows = filter_affordable_recommendations(all_rows)
+    now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+    conn.execute(
+        """INSERT INTO product_recommend_cache (id, capital, rows_json, updated_at)
+           VALUES (1, ?, ?, ?)
+           ON CONFLICT(id) DO UPDATE SET
+             capital=excluded.capital,
+             rows_json=excluded.rows_json,
+             updated_at=excluded.updated_at""",
+        (float(capital or 0), json.dumps(rows, ensure_ascii=False), now),
+    )
+    conn.commit()
+    return rows
+
+
+def load_recommend_cache(conn) -> dict:
+    """优先从数据库读取推荐列表。"""
+    ensure_recommend_tables(conn)
+    row = conn.execute("SELECT capital, rows_json, updated_at FROM product_recommend_cache WHERE id=1").fetchone()
+    if not row:
+        return {"capital": 0.0, "rows": [], "updated_at": None}
+    try:
+        rows = json.loads(row["rows_json"] or "[]")
+    except (TypeError, ValueError, json.JSONDecodeError):
+        rows = []
+    return {
+        "capital": float(row["capital"] or 0),
+        "rows": rows if isinstance(rows, list) else [],
+        "updated_at": row["updated_at"],
+    }