完成请求推送，但组装mes还有问题

backend/services/system_settings_service.py

@@ -0,0 +1,95 @@
+"""
+系统设置服务
+
+负责加载、保存和管理全局系统设置。
+"""
+import json
+import logging
+from pathlib import Path
+from typing import Optional
+
+from core.config import settings
+from models.system_settings import SystemSettings, DEFAULT_SYSTEM_SETTINGS
+
+logger = logging.getLogger(__name__)
+
+
+class SystemSettingsService:
+    """
+    系统设置服务
+    
+    提供设置的加载、保存和访问功能
+    """
+    
+    def __init__(self):
+        self.settings_file = settings.SYSTEM_SETTINGS_FILE
+        self._settings: Optional[SystemSettings] = None
+        self._load_settings()
+    
+    def _load_settings(self):
+        """从文件加载系统设置"""
+        if self.settings_file.exists():
+            try:
+                with open(self.settings_file, 'r', encoding='utf-8') as f:
+                    data = json.load(f)
+                
+                self._settings = SystemSettings(**data)
+                logger.info(f"加载系统设置成功")
+            except Exception as e:
+                logger.error(f"加载系统设置失败: {e}")
+                self._settings = DEFAULT_SYSTEM_SETTINGS.copy()
+        else:
+            logger.info("系统设置文件不存在，使用默认设置")
+            self._settings = DEFAULT_SYSTEM_SETTINGS.copy()
+            self._save_settings()
+    
+    def _save_settings(self):
+        """保存系统设置到文件"""
+        try:
+            # 确保父目录存在
+            self.settings_file.parent.mkdir(parents=True, exist_ok=True)
+            
+            # 写入文件
+            with open(self.settings_file, 'w', encoding='utf-8') as f:
+                json.dump(self._settings.dict(), f, ensure_ascii=False, indent=2)
+            
+            logger.info(f"系统设置已保存到 {self.settings_file}")
+        except Exception as e:
+            logger.error(f"保存系统设置失败: {e}")
+    
+    @property
+    def settings(self) -> SystemSettings:
+        """获取当前系统设置"""
+        return self._settings
+    
+    def update_thinking_tags(self, prefix: str, suffix: str):
+        """更新思考标签配置"""
+        self._settings.thinkingTagPrefix = prefix
+        self._settings.thinkingTagSuffix = suffix
+        self._settings.updatedAt = int(__import__('time').time())
+        self._save_settings()
+        logger.info(f"思考标签已更新: {prefix} ... {suffix}")
+    
+    def update_current_preset(self, preset_name: Optional[str]):
+        """更新当前选中的预设名称"""
+        self._settings.currentPresetName = preset_name
+        self._settings.updatedAt = int(__import__('time').time())
+        self._save_settings()
+        logger.info(f"当前预设已更新: {preset_name}")
+    
+    def get_thinking_tag_pattern(self) -> str:
+        """获取思考标签的正则表达式模式"""
+        prefix = self._settings.thinkingTagPrefix
+        suffix = self._settings.thinkingTagSuffix
+        
+        # 转义特殊字符
+        import re
+        escaped_prefix = re.escape(prefix)
+        escaped_suffix = re.escape(suffix)
+        
+        # 返回匹配思考内容的正则模式
+        return f"{escaped_prefix}[\\s\\S]*?{escaped_suffix}"
+
+
+# 全局实例
+system_settings_service = SystemSettingsService()