fix: correct agent config form URLs and add config management menu item

- Fix agent_config_form.ui data_url and submit_url paths
  (wwwroot/ to wwwroot/api/ needs 'api/', not '../api/')
- Add '配置管理' menu entry to menu.ui pointing to harnessed_agent_config_view CRUD

wwwroot/agent_config_form.ui

@@ -17,9 +17,9 @@
                             "widgettype": "Form",
                             "id": "agent_config_form",
                             "options": {
-                                "data_url": "{{entire_url('../api/agent_config_get.dspy')}}",
+                                "data_url": "{{entire_url('api/agent_config_get.dspy')}}",
                                 "data_method": "GET",
-                                "submit_url": "{{entire_url('../api/agent_config_save.dspy')}}",
+                                "submit_url": "{{entire_url('api/agent_config_save.dspy')}}",
                                 "method": "POST",
                                 "layout": "vertical",
                                 "fields": [

wwwroot/menu.ui

@@ -25,6 +25,11 @@
                 "label":"代理配置",
                 "url":"{{entire_url('/harnessed_agent/agent_config.ui')}}"
             },
+            {
+                "name":"harnessed_agent_config_view",
+                "label":"配置管理",
+                "url":"{{entire_url('/harnessed_agent/harnessed_agent_config_view')}}"
+            },
             {
                 "name":"sessions",
                 "label":"会话管理",