fix(HEL-356): restore intraday turnover context

Co-authored-by: multica-agent <github@multica.ai>

backend/data/providers/tushare_industries.py

@@ -541,6 +541,13 @@ class ShenwanIndustryMixin:
         for item in valid:
             capital = capital_map.get(str(item.get("ts_code") or ""), {})
             float_share = _number(capital.get("float_share"))
+            previous = _number(
+                item.get("pre_close")
+                if item.get("pre_close") not in (None, "")
+                else item.get("previous_close")
+            )
+            if not float_share and previous:
+                float_share = _number(capital.get("circ_mv")) / previous
             volume = _number(item.get("vol"))
             if float_share and volume:
                 # 免费源成交量为股；daily_basic.float_share 为万股。
@@ -549,6 +556,13 @@ class ShenwanIndustryMixin:
         for item in market_rows:
             capital = capital_map.get(str(item.get("ts_code") or ""), {})
             float_share = _number(capital.get("float_share"))
+            previous = _number(
+                item.get("pre_close")
+                if item.get("pre_close") not in (None, "")
+                else item.get("previous_close")
+            )
+            if not float_share and previous:
+                float_share = _number(capital.get("circ_mv")) / previous
             volume = _number(item.get("vol"))
             if float_share and volume:
                 market_turnovers.append(volume / float_share / 100)