fix: 宇宙获取三级兜底（新浪→东财→资金流表）

src/quant/engine.py

@@ -42,16 +42,38 @@ class QuantEngine:
 
     def universe(self, n=UNIVERSE_N):
         import akshare as ak
+        # 1) 新浪全市场快照
         try:
             df = ak.stock_zh_a_spot()
             df['amt'] = pd.to_numeric(df.get('成交额'), errors='coerce')
             df['code'] = df.get('代码').astype(str).str[-6:]
             df = df[df['code'].str[:2].isin(('60', '00', '30', '68'))]
             df = df.sort_values('amt', ascending=False).head(n)
-            return list(df['code']), dict(zip(df['code'], df['名称'].astype(str)))
+            pairs = list(zip(df['code'], df['名称'].astype(str)))
+            if pairs:
+                return [c for c, _ in pairs], dict(pairs)
         except Exception as e:
-            print('[quant] 宇宙获取失败:', e, flush=True)
+            print('[quant] 新浪宇宙失败，改用东财:', e, flush=True)
-            return [], {}
+        # 2) 东财全市场快照兜底
+        try:
+            df = ak.stock_zh_a_spot_em()
+            df['amt'] = pd.to_numeric(df.get('成交额'), errors='coerce')
+            df['code'] = df.get('代码').astype(str).str[-6:]
+            df = df[df['code'].str[:2].isin(('60', '00', '30', '68'))]
+            df = df.sort_values('amt', ascending=False).head(n)
+            pairs = list(zip(df['code'], df['名称'].astype(str)))
+            if pairs:
+                return [c for c, _ in pairs], dict(pairs)
+        except Exception as e:
+            print('[quant] 东财宇宙失败:', e, flush=True)
+        # 3) 兜底：资金流表中的活跃股
+        conn = self.fetcher._conn()
+        try:
+            rows = conn.execute("SELECT DISTINCT ts_code FROM money_flow LIMIT ?",
+                                (n,)).fetchall()
+            return [r[0] for r in rows], {}
+        finally:
+            pass
 
     def _kline_worker(self):
         """后台轮询：持续刷新宇宙内 K 线（day 全量 + 30/5 分钟）"""