feat: add fill-assist handlers and update device response type

src/handlers/fill-assist.ts

@@ -0,0 +1,36 @@
+const EMPTY_FORMS_FILENAME = 'forms.v1.json';
+const EMPTY_FORMS_BODY = JSON.stringify({
+  schemaVersion: '1.0.0',
+  hosts: {},
+});
+const EMPTY_MANIFEST_BODY = JSON.stringify({
+  maps: {
+    forms: {
+      v1: {
+        filename: EMPTY_FORMS_FILENAME,
+        cid: 'sha256:nodewarden-empty-fill-assist-v1',
+      },
+    },
+  },
+});
+
+function fillAssistJsonResponse(body: string): Response {
+  return new Response(body, {
+    status: 200,
+    headers: {
+      'Content-Type': 'application/json; charset=utf-8',
+      'Cache-Control': 'public, max-age=3600',
+    },
+  });
+}
+
+export function handleFillAssistManifest(): Response {
+  return fillAssistJsonResponse(EMPTY_MANIFEST_BODY);
+}
+
+export function handleFillAssistForms(filename: string): Response {
+  if (String(filename || '').trim() !== EMPTY_FORMS_FILENAME) {
+    return new Response('Not found', { status: 404 });
+  }
+  return fillAssistJsonResponse(EMPTY_FORMS_BODY);
+}