feat(js): add app-http contracts and migrate helpdesk runtime layer

web/js/app-init.js

@@ -25,6 +25,7 @@ import { initTabs } from './components/app-tabs.js';
 import { initSessionWarning } from './components/app-session-warning.js';
 import { initFsLightboxRefresh } from './components/app-fslightbox-refresh.js';
 import { initFileUpload } from './components/app-file-upload.js';
+import { initLookupFields } from './components/app-lookup-field.js';
 
 const runtime = createComponentRuntime({
   root: document,
@@ -193,6 +194,13 @@ const bootRuntime = async () => {
     selector: '[data-app-component="file-upload"]',
     configPath: 'components.fileUpload',
   });
+  runtime.register('lookup-field', initLookupFields, {
+    scope: 'global',
+    configPath: 'components.lookupField',
+    defaultConfig: {
+      selector: '[data-app-lookup]',
+    },
+  });
   await mountModuleComponentsByPhase('early');
 
   // Phase B: structure-defining components.