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>

kline_chart.py

@@ -220,20 +220,39 @@ def _timeshare_session(bars: list) -> list:
 
 
 def bars_to_api(bars: list) -> list[dict]:
-    """转为前端图表 JSON。"""
-    result = []
+    """转为前端图表 JSON（去重、排序、数值规范化）。"""
+    result: list[dict] = []
+    seen: dict[int, dict] = {}
     for bar in bars:
         dt = _bar_datetime(bar)
         ts = int(dt.timestamp() * 1000) if dt else None
-        result.append({
+        try:
+            o = float(bar.get("o") or 0)
+            h = float(bar.get("h") or o)
+            l = float(bar.get("l") or o)
+            c = float(bar.get("c") or o)
+            v = float(bar.get("v") or 0)
+        except (TypeError, ValueError):
+            continue
+        if h < l:
+            h, l = l, h
+        h = max(h, o, c)
+        l = min(l, o, c)
+        row = {
             "time": bar["d"],
             "timestamp": ts,
-            "open": bar["o"],
-            "high": bar["h"],
-            "low": bar["l"],
-            "close": bar["c"],
-            "volume": bar.get("v", 0),
-        })
+            "open": o,
+            "high": h,
+            "low": l,
+            "close": c,
+            "volume": v,
+        }
+        if ts is not None:
+            seen[ts] = row
+        else:
+            result.append(row)
+    if seen:
+        result = [seen[k] for k in sorted(seen.keys())]
     return result