fix(new_session.ui): correct Form field configuration per bricks-framework spec

- Replace 'select' uitype with 'code' uitype
- Use data_url instead of options.url for dynamic data loading
- Add valueField and textField to map backend response fields
- Fix URL path to /hermes-web-cli/hermes_services/list/
- Complies with module-development-spec and bricks-framework requirements

wwwroot/new_session.ui

@@ -25,14 +25,14 @@
         "maxWidth": "600px",
         "fields": [
           {
-            "uitype": "select",
+            "uitype": "code",
             "name": "service_id",
             "label": "Select Service",
             "required": true,
             "placeholder": "Choose a Hermes service",
-            "options": {
-              "url": "/hermes-web-cli/hermes_services/options"
-            }
+            "data_url": "/hermes-web-cli/hermes_services/list/",
+            "valueField": "value",
+            "textField": "text"
           }
         ]
       },