feat(tool system): Optimization of the tool system

1. Optimization of the JSON tool, add insert, replace, delete, parse
2. Optimization of the mcp test_connection
3. tool list desc
4. datetime_tool default timezone set Asia/Shanghai

api/app/schemas/tool_schema.py

@@ -225,7 +225,7 @@ class CustomToolCreateRequest(BaseModel):
 
 class ParseSchemaRequest(BaseModel):
     """解析Schema请求"""
-    schema_content: Optional[Dict[str, Any]] = Field(None, description="OpenAPI schema内容")
+    schema_content: Optional[str] = Field(None, description="OpenAPI schema内容")
     schema_url: Optional[str] = Field(None, description="OpenAPI schema URL")