fix: 品种推荐改为最大手数并补算旧缓存。

- 最大手数 = floor(权益×保证金上限%÷1手保证金)
- 加载与 SSE 推送时实时补算，旧缓存缺字段时自动刷新

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

recommend_stream.py

@@ -10,7 +10,13 @@ from typing import Callable, Optional
 
 from db_conn import connect_db
 from kline_stream import sse_format
-from recommend_store import load_recommend_cache, recommend_cache_stale, refresh_recommend_cache
+from recommend_store import (
+    load_recommend_cache,
+    recommend_cache_stale,
+    recommend_payload,
+    refresh_recommend_cache,
+    rows_missing_max_lots,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -72,13 +78,15 @@ def start_recommend_worker(
                     mode = get_mode_fn() if get_mode_fn else "simulation"
                     max_pct = float(get_max_margin_pct_fn()) if get_max_margin_pct_fn else 30.0
                     cached = load_recommend_cache(conn)
-                    if recommend_cache_stale(cached.get("updated_at")):
+                    if recommend_cache_stale(cached.get("updated_at")) or rows_missing_max_lots(
+                        cached.get("rows") or [],
+                    ):
                         refresh_recommend_cache(
                             conn, capital, quote_fn, trading_mode=mode, max_margin_pct=max_pct,
                         )
                         cached = load_recommend_cache(conn)
-                        logger.info("品种推荐每日刷新完成，capital=%.2f rows=%d", capital, len(cached.get("rows") or []))
-                    payload = {**cached, "capital": capital}
+                        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)
                 finally:
                     conn.close()
                 recommend_hub.broadcast("recommend", {"ok": True, **payload})