feat(09-03): scaffold Winter admin controller layout

- config_form.yaml and config_list.yaml point at models/<name>/fields.yaml and columns.yaml
- Duplicate model or controller assets fail before any new file is written

internal/build/stubs/artifacts.tmpl

@@ -105,6 +105,27 @@ func ({{.Worker}}) ConfigDir() string { return {{printf "%q" .ConfigDir}} }
 func {{.Func}}() pact.AdminController { return {{.Worker}}{} }
 {{end}}
 
+{{define "config_form.yaml"}}name: {{.Ident}}
+form: ~/plugins/{{.PluginPath}}/models/{{.Snake}}/fields.yaml
+modelClass: {{.Ident}}
+defaultRedirect: {{.PluginPath}}/{{.Snake}}
+
+create:
+    redirect: {{.PluginPath}}/{{.Snake}}/update/:id
+    redirectClose: {{.PluginPath}}/{{.Snake}}
+
+update:
+    redirect: {{.PluginPath}}/{{.Snake}}
+    redirectClose: {{.PluginPath}}/{{.Snake}}
+{{end}}
+
+{{define "config_list.yaml"}}list: ~/plugins/{{.PluginPath}}/models/{{.Snake}}/columns.yaml
+modelClass: {{.Ident}}
+title: {{.Ident}}
+recordsPerPage: 20
+showSearch: true
+{{end}}
+
 {{define "fields.yaml"}}fields:
     id:
         label: ID