feat(stock_data_api): 搜索股票时包含深交所指数

- 将指数市场范围从上交所(SSE)扩展到包括深交所(SZSE)
- 优化了股票和指数的搜索逻辑，提高搜索结果的全面性

Author: spark

backend/data/stock_data_api.go

@@ -319,7 +319,7 @@ func (receiver StockDataApi) GetStockList(key string) []StockBasic {
 	var result []StockBasic
 	db.Dao.Model(&StockBasic{}).Where("name like ? or ts_code like ?", "%"+key+"%", "%"+key+"%").Find(&result)
 	var result2 []IndexBasic
-	db.Dao.Model(&IndexBasic{}).Where("market = ?", "SSE").Where("name like ? or ts_code like ?", "%"+key+"%", "%"+key+"%").Find(&result2)
+	db.Dao.Model(&IndexBasic{}).Where("market in ?", []string{"SSE", "SZSE"}).Where("name like ? or ts_code like ?", "%"+key+"%", "%"+key+"%").Find(&result2)
 
 	for _, item := range result2 {
 		result = append(result, StockBasic{