fix: refactor tool initialization parameters handling in base_chat_step and base_chat_node

--bug=1069435@tapd-62980211 --user=刘瑞斌 【工具】新创建的工具，启动参数必须要手动保存，才能使用默认值 https://www.tapd.cn/62980211/s/1925056

Author: liuruibin

apps/application/chat_pipeline/step/chat_step/impl/base_chat_step.py

@@ -279,11 +279,10 @@ def _handle_mcp_request(self, mcp_source, mcp_servers, mcp_tool_ids, tool_ids,
                     continue
                 executor = ToolExecutor()
                 if tool.init_params is not None:
-                    params = json.loads(rsa_long_decrypt(tool.init_params))
                     tool_init_params = json.loads(rsa_long_decrypt(tool.init_params))
                 else:
-                    params = {}
-                tool_config = executor.get_tool_mcp_config(tool, params)
+                    tool_init_params = {i["field"]: i.get('default_value') for i in tool.init_field_list}
+                tool_config = executor.get_tool_mcp_config(tool, tool_init_params)
 
                 mcp_servers_config[str(tool.id)] = tool_config
 

apps/application/flow/step_node/ai_chat_step_node/impl/base_chat_node.py

@@ -277,11 +277,10 @@ def _handle_mcp_request(self, mcp_source, mcp_servers, mcp_tool_id, mcp_tool_ids
                     continue
                 executor = ToolExecutor()
                 if tool.init_params is not None:
-                    params = json.loads(rsa_long_decrypt(tool.init_params))
                     tool_init_params = json.loads(rsa_long_decrypt(tool.init_params))
                 else:
-                    params = {}
-                tool_config = executor.get_tool_mcp_config(tool, params)
+                    tool_init_params = {i["field"]: i.get('default_value') for i in tool.init_field_list}
+                tool_config = executor.get_tool_mcp_config(tool, tool_init_params)
 
                 mcp_servers_config[str(tool.id)] = tool_config