feat: 新增中庸实践思维量表和SCL90量表

新增中文版中庸实践思维量表和英文版SCL90量表，用于心理评估。同时优化了加载问卷数据的逻辑，支持递归遍历文件夹以加载所有问卷文件。

app.py

@@ -13,7 +13,6 @@ app.mount("/static", StaticFiles(directory="static"), name="static")
 
 # 加载所有问卷数据
 def load_all_scales():
-    scale_folder = os.path.realpath('scales')
     scales = {}
     tags = {}
     try:
@@ -21,10 +20,11 @@ def load_all_scales():
             tagmap = yaml.safe_load(f)
     except Exception as e:
         print(f"Error loading scale langmap: {e}")
-    for filename in os.listdir(scale_folder):
+    for root, dirs, files in os.walk(os.path.realpath('scales')):
+        for filename in files:
             if filename.endswith(('.yaml', '.yml')):
                 try:
-                with open(os.path.join(scale_folder, filename), 'r', encoding='utf-8') as f:
+                    with open(os.path.join(root, filename), 'r', encoding='utf-8') as f:
                         scale = yaml.safe_load(f)
                         scale['instructions']=markdown.markdown(scale['instructions'], extensions=['fenced_code','tables','mdx_math'])
                         scale['descriptions']=markdown.markdown(scale['descriptions'], extensions=['fenced_code','tables','mdx_math'])