Localization: Update error messages to Chinese

app.py

@@ -153,7 +153,7 @@ def analyze():
     try:
         data = request.json
         if not data:
-            return jsonify({'success': False, 'error': 'No data provided'}), 400
+            return jsonify({'success': False, 'error': '未提供数据'}), 400
 
         # 获取参数，提供默认值
         cost = float(data.get('cost', 10.0))
@@ -181,11 +181,11 @@ def upload_file():
     """
     try:
         if 'file' not in request.files:
-            return jsonify({'success': False, 'error': 'No file part'}), 400
+            return jsonify({'success': False, 'error': '未找到上传文件'}), 400
         
         file = request.files['file']
         if file.filename == '':
-            return jsonify({'success': False, 'error': 'No selected file'}), 400
+            return jsonify({'success': False, 'error': '未选择文件'}), 400
             
         if file:
             filename = secure_filename(file.filename)
@@ -199,9 +199,9 @@ def upload_file():
                 elif filename.endswith(('.xls', '.xlsx')):
                     df = pd.read_excel(filepath)
                 else:
-                    return jsonify({'success': False, 'error': 'Unsupported file format'}), 400
+                    return jsonify({'success': False, 'error': '不支持的文件格式 (仅支持 .csv, .xls, .xlsx)'}), 400
             except Exception as e:
-                return jsonify({'success': False, 'error': f'File read error: {str(e)}'}), 400
+                return jsonify({'success': False, 'error': f'文件读取错误: {str(e)}'}), 400
 
             # 检查必需列
             required_cols = ['cost', 'base_price', 'base_demand']
@@ -248,7 +248,7 @@ def upload_file():
 
     except Exception as e:
         logger.error(f"Upload Error: {str(e)}")
-        return jsonify({'success': False, 'error': str(e)}), 500
+        return jsonify({'success': False, 'error': f"服务器内部错误: {str(e)}"}), 500
 
 if __name__ == '__main__':
     port = int(os.environ.get('PORT', 7860))