feat: 将 JSON 处理库从 json 更改为 orjson，以提高性能和兼容性

src/plugin_system/core/mcp_client_manager.py

@@ -5,7 +5,7 @@ MCP Client Manager
 """
 
 import asyncio
-import json
+import orjson
 import shutil
 from pathlib import Path
 from typing import Any
@@ -89,7 +89,7 @@ class MCPClientManager:
 
         try:
             with open(self.config_path, encoding="utf-8") as f:
-                config_data = json.load(f)
+                config_data = orjson.loads(f.read())
 
             servers = {}
             mcp_servers = config_data.get("mcpServers", {})
@@ -106,7 +106,7 @@ class MCPClientManager:
             logger.info(f"成功加载 {len(servers)} 个 MCP 服务器配置")
             return servers
 
-        except json.JSONDecodeError as e:
+        except orjson.JSONDecodeError as e:
             logger.error(f"解析 MCP 配置文件失败: {e}")
             return {}
         except Exception as e:

src/plugin_system/core/tool_use.py

@@ -236,10 +236,10 @@ class ToolExecutor:
             if isinstance(content, str):
                 result_preview = content
             elif isinstance(content, list | dict):
-                import json
+                import orjson
 
                 try:
-                    result_preview = json.dumps(content, ensure_ascii=False)
+                    result_preview = orjson.dumps(content, option=orjson.OPT_NON_STR_KEYS).decode('utf-8')
                 except Exception:
                     result_preview = str(content)
             else: