feat: improve float value display in export excel

Author: ulleo

backend/apps/chat/curd/chat.py

@@ -1,4 +1,5 @@
 import datetime
+from decimal import Decimal
 from typing import List, Optional, Union, Dict, Any
 
 import orjson
@@ -207,7 +208,7 @@ def format_json_list_data(origin_data: list[dict]):
                         value = str(value)
                     # 小数且超过15位有效数字 → 转字符串并标记为文本列
                     elif isinstance(value, float):
-                        decimal_str = format(value, '.16f').rstrip('0').rstrip('.')
+                        decimal_str = str(Decimal(str(value))).rstrip('0').rstrip('.')
                         if len(decimal_str) > 15:
                             value = str(value)
             _row[key] = value

backend/common/utils/data_format.py

@@ -1,3 +1,5 @@
+from decimal import Decimal
+
 import pandas as pd
 
 from apps.chat.models.chat_model import AxisObj
@@ -53,7 +55,7 @@ def format_float_without_scientific(value):
             """格式化浮点数，避免科学记数法"""
             if value == 0:
                 return "0"
-            formatted = f"{value:.15f}"
+            formatted = str(Decimal(str(value)))
             if '.' in formatted:
                 formatted = formatted.rstrip('0').rstrip('.')
             return formatted