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>

fee_specs.py

@@ -37,6 +37,26 @@ def _get_db():
     return connect_db()
 
 
+def ensure_fee_rates_schema(conn=None) -> None:
+    """补齐 fee_rates 表结构（旧库可能缺少 source 列）。"""
+    close = False
+    if conn is None:
+        conn = _get_db()
+        close = True
+    try:
+        for sql in (
+            "ALTER TABLE fee_rates ADD COLUMN source TEXT DEFAULT 'local'",
+        ):
+            try:
+                conn.execute(sql)
+            except sqlite3.OperationalError:
+                pass
+        conn.commit()
+    finally:
+        if close:
+            conn.close()
+
+
 def get_setting(key: str, default: str = "") -> str:
     conn = _get_db()
     row = conn.execute("SELECT value FROM settings WHERE key=?", (key,)).fetchone()
@@ -111,6 +131,7 @@ def get_fee_spec(ths_code: str, *, trading_mode: str = "simulation") -> dict:
 
     mult = get_contract_spec(ths_code)["mult"]
     conn = _get_db()
+    ensure_fee_rates_schema(conn)
     row = conn.execute(
         "SELECT * FROM fee_rates WHERE product=? AND source='ctp'",
         (product,),