feat: linebot

1. show error on line

app/Linebot_handler/Expense.py

@@ -165,8 +165,10 @@ def save_expense(line_user_id: str, fields: dict) -> str:
         return reply.strip()
     except Exception as e:
         db.rollback()
-        print("❌ 儲存失敗:", e)
-        return "儲存失敗，請稍後再試"
+        import traceback
+        error_detail = traceback.format_exc() # 抓取詳細錯誤堆疊
+        print("❌ 儲存失敗:", error_detail)
+        return f"儲存失敗！錯誤訊息：\n{str(e)}" # 暫時把錯誤回傳到 Line
     finally:
         db.close()