fix(HEL-494): 日K默认45根并修复问天行业0/205覆盖

悬浮窗和详情页只画最近45个交易日，中枢仍保留250日历史。盘后缺sw_daily时保留成分日线内核，外显走免费申万；成分行情改为全市场快照+分页，不再截成前60只。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

backend/data/datahub/bridge.py

@@ -148,7 +148,7 @@ class DatahubBridge:
         cleaned = [str(item or "").strip() for item in codes if str(item or "").strip()]
         if not cleaned:
             return None
-        return self._try_quote_rows("quotes", {"codes": ",".join(cleaned[:60])}, minimum=1)
+        return self._try_quote_rows("quotes", {"codes": ",".join(cleaned)}, minimum=1)
 
     def try_index_quotes(self) -> list[dict[str, Any]] | None:
         flags = self.settings.flags("index_quotes")
@@ -208,7 +208,7 @@ class DatahubBridge:
             if not rows:
                 raise DatahubError("EMPTY", f"{dataset} chart empty")
             self._record_route(dataset, "datahub", str((response.meta or {}).get("source") or "datahub"))
-            return rows[-max(20, min(180, int(limit))):]
+            return rows[-max(1, int(limit)):]
         except Exception as exc:
             self._log_failure(dataset, exc)
             return None