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>

install_trading.py

@@ -22,9 +22,9 @@ from position_sizing import (
 )
 from recommend_store import (
     load_recommend_cache,
+    recommend_cache_needs_refresh,
     recommend_payload,
     refresh_recommend_cache,
-    rows_missing_max_lots,
 )
 from recommend_stream import recommend_hub, start_recommend_worker
 from ctp_reconnect import start_ctp_reconnect_worker
@@ -407,11 +407,31 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
             sizing = get_sizing_mode(get_setting)
             max_pct = get_max_margin_pct(get_setting)
             rec_loaded = load_recommend_cache(conn)
-            if rec_loaded.get("stale") or rows_missing_max_lots(rec_loaded.get("rows") or []):
-                refresh_recommend_cache(
-                    conn, capital, _main_quote, trading_mode=mode, max_margin_pct=max_pct,
-                )
+            if recommend_cache_needs_refresh(rec_loaded, capital=capital):
+                try:
+                    refresh_recommend_cache(
+                        conn, capital, _main_quote, trading_mode=mode, max_margin_pct=max_pct,
+                    )
+                except Exception as exc:
+                    logger.warning("positions recommend refresh failed: %s", exc)
             rec_cache = recommend_payload(conn, live_capital=capital, max_margin_pct=max_pct)
+            if not rec_cache.get("rows") and capital > 0:
+                try:
+                    from product_recommend import list_product_recommendations
+                    from recommend_store import enrich_recommend_rows, filter_affordable_recommendations
+
+                    live_rows = filter_affordable_recommendations(
+                        list_product_recommendations(
+                            capital, _main_quote, max_margin_pct=max_pct, trading_mode=mode,
+                        )
+                    )
+                    if live_rows:
+                        rec_cache["rows"] = enrich_recommend_rows(
+                            live_rows, capital, max_margin_pct=max_pct,
+                        )
+                        rec_cache["updated_at"] = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+                except Exception as exc:
+                    logger.warning("positions recommend live fallback failed: %s", exc)
             return render_template(
                 "trade.html",
                 trading_mode=mode,