fix: make SUPER_ADMIN role checks case-insensitive across app

Co-authored-by: aider (openai/DeepSeek-V3.2-Thinking) <aider@aider.chat>

inventory-backend/app/api/v1/auth.py

@@ -19,8 +19,8 @@ def get_current_user_permissions():
     user_role = claims.get('role')
     if not user_role:
         return []
-    # 超级管理员返回所有字段权限
-    if user_role == 'super_admin':
+    # 超级管理员返回所有字段权限 (忽略大小写)
+    if user_role.upper() == 'SUPER_ADMIN':
         return ['system_user:*']
     perm_dict = AuthService.get_user_permissions(user_role)
     # 合并菜单和元素权限