更新 app.py 檔案，簡化 HTML 預覽 API 的日誌輸出

- 移除多餘的日誌輸出，減少不必要的控制台訊息，提升程式碼可讀性
- 確保在返回生成的 HTML 時，仍然保留必要的調試資訊

此次更新旨在簡化程式碼，提升效能與可維護性。

app.py

@@ -104,37 +104,17 @@ async def preview_html(
 ):
     """API endpoint to preview HTML with variables"""
     try:
-        # Log 1: 接收到的原始資料
-        print("=== API Preview Called ===")
-        print(f"Template length: {len(template_content)} characters")
-        print(f"Template preview: {template_content[:200]}...")
-        print(f"Variables received: {variables}")
-        
-        # Log 2: 解析 JSON
         variables_dict = json.loads(variables)
-        print(f"\nParsed variables: {json.dumps(variables_dict, indent=2, ensure_ascii=False)}")
-        
-        # Log 3: 獲取額外資料
         awards_data = get_sheets_data()
-        print(f"\nAwards data count: {len(awards_data)}")
         
-        # Log 4: 添加額外變數
         variables_dict['awards_data'] = awards_data
         variables_dict['current_year'] = datetime.now().year
-        print(f"\nAdded current_year: {variables_dict['current_year']}")
-        
-        # Log 5: 所有變數的 keys
-        print(f"\nAll variable keys: {list(variables_dict.keys())}")
         
-        # Log 6: 渲染模板
         from jinja2 import Template
         template = Template(template_content)
         generated_html = template.render(**variables_dict)
-        print(f"\nGenerated HTML length: {len(generated_html)} characters")
-        print(f"Generated HTML preview: {generated_html[:300]}...")
         
-        # Log 7: 返回資料
-        return_data = {
+        return {
             "html": generated_html,
             "debug": {
                 "variables_count": len(variables_dict),
@@ -142,15 +122,8 @@ async def preview_html(
                 "template_length": len(template_content)
             }
         }
-        print(f"\nReturning success with HTML length: {len(generated_html)}")
-        
-        return return_data
     except Exception as e:
-        print(f"\n!!! ERROR in preview_html: {str(e)}")
-        print(f"Error type: {type(e).__name__}")
         import traceback
-        print(f"Traceback: {traceback.format_exc()}")
-        
         return {
             "error": str(e), 
             "html": "",