增加设备私有配置，每台设备可以配置不同的模型和提示词

增加后台管理功能，可以通过后台调整设备私有配置信息

manager/user_manager.py

@@ -0,0 +1,67 @@
+import os
+import yaml
+import hashlib
+import logging
+
+logger = logging.getLogger(__name__)
+
+class UserManager:
+    def __init__(self):
+        self.secrets_path = os.path.join(os.path.dirname(os.path.dirname(__file__)), '.secrets.yaml')
+        self.users = {}
+        self.ensure_secrets_file()
+        self.load_user_data()
+
+    def ensure_secrets_file(self):
+        """确保 .secrets.yaml 文件存在"""
+        if not os.path.exists(self.secrets_path):
+            default_config = {
+                'users': {}
+            }
+            try:
+                with open(self.secrets_path, 'w', encoding='utf-8') as f:
+                    yaml.dump(default_config, f)
+                os.chmod(self.secrets_path, 0o600)
+                logger.info("Created new .secrets.yaml file")
+            except Exception as e:
+                logger.error(f"Failed to create .secrets.yaml: {e}")
+                raise
+
+    def load_user_data(self):
+        """加载用户数据"""
+        try:
+            with open(self.secrets_path, 'r', encoding='utf-8') as f:
+                data = yaml.safe_load(f) or {'users': {}}
+                self.users = data['users']
+                logger.info("Successfully loaded user data")
+        except Exception as e:
+            logger.error(f"Failed to load user data: {e}")
+            self.users = {}
+
+    def save_user_data(self):
+        """保存用户数据"""
+        try:
+            with open(self.secrets_path, 'w', encoding='utf-8') as f:
+                yaml.dump({'users': self.users}, f)
+            logger.info("Successfully saved user data")
+        except Exception as e:
+            logger.error(f"Failed to save user data: {e}")
+            raise
+
+    def hash_password(self, password):
+        """密码哈希"""
+        return hashlib.sha256(password.encode()).hexdigest()
+
+    def get_users(self):
+        """获取所有用户"""
+        return self.users
+
+    def get_user(self, username):
+        """获取指定用户"""
+        return self.users.get(username)
+
+    def update_user(self, username, data):
+        """更新用户数据"""
+        if username in self.users:
+            self.users[username].update(data)
+            self.save_user_data()