fix: TradingView K线图表并修复品种推荐为空。

- 行情页改用 Lightweight Charts 标准蜡烛图（红跌绿涨）
- 修复 fee_rates 缺 source 列导致推荐刷新失败
- 空缓存自动重试，持仓页实时兜底计算推荐列表

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

recommend_stream.py

@@ -12,10 +12,9 @@ from db_conn import connect_db
 from kline_stream import sse_format
 from recommend_store import (
     load_recommend_cache,
-    recommend_cache_stale,
+    recommend_cache_needs_refresh,
     recommend_payload,
     refresh_recommend_cache,
-    rows_missing_max_lots,
 )
 
 logger = logging.getLogger(__name__)
@@ -78,9 +77,7 @@ 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")) or rows_missing_max_lots(
-                        cached.get("rows") or [],
-                    ):
+                    if recommend_cache_needs_refresh(cached, capital=capital):
                         refresh_recommend_cache(
                             conn, capital, quote_fn, trading_mode=mode, max_margin_pct=max_pct,
                         )