K线数据首选mootdx通达信TCP源，板块数据增加mootdx降级

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/routes/sectors.py

@@ -1,7 +1,7 @@
 """板块数据路由：行业板块、概念板块"""
 
 from fastapi import APIRouter, Query, HTTPException
-from services import eastmoney
+from services import eastmoney, mootdx
 
 router = APIRouter()
 
@@ -14,4 +14,12 @@ async def sector_list(
         raise HTTPException(status_code=400, detail="板块类型错误，仅支持 industry/concept")
 
     data = await eastmoney.fetch_sector_list(type)
-    return {"data": data, "count": len(data), "type": type}
+    if data:
+        return {"data": data, "count": len(data), "type": type}
+
+    # 降级：通达信 mootdx（不含实时资金流数据）
+    md_data = await mootdx.fetch_sector_list(type)
+    if md_data:
+        return {"data": md_data, "count": len(md_data), "type": type, "source": "mootdx"}
+
+    return {"data": [], "count": 0, "type": type}