fix: make manifest optional in ObjectStackDefinitionSchema to prevent white screen on Vercel deploy

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/spec/src/stack.test.ts

@@ -411,8 +411,8 @@ describe('ObjectStackDefinitionSchema', () => {
     expect(() => ObjectStackDefinitionSchema.parse(definition)).not.toThrow();
   });
 
-  it('should require manifest field', () => {
-    expect(() => ObjectStackDefinitionSchema.parse({})).toThrow();
+  it('should accept definition without manifest (manifest is optional)', () => {
+    expect(() => ObjectStackDefinitionSchema.parse({})).not.toThrow();
   });
 });
 
@@ -525,6 +525,17 @@ describe('defineStack', () => {
     // No objects defined, so cross-ref validation is skipped
     expect(() => defineStack(config, { strict: true })).not.toThrow();
   });
+
+  it('should accept config without manifest (manifest is optional)', () => {
+    const config = {
+      objects: [
+        { name: 'task', fields: { title: { type: 'text' } } },
+      ],
+    };
+    const result = defineStack(config as any);
+    expect(result.manifest).toBeUndefined();
+    expect(result.objects).toHaveLength(1);
+  });
 });
 
 describe('defineStack - Field Name Validation', () => {

packages/spec/src/stack.zod.ts

@@ -72,7 +72,7 @@ import { ConnectorSchema } from './integration/connector.zod';
  */
 export const ObjectStackDefinitionSchema = z.object({
   /** System Configuration */
-  manifest: ManifestSchema.describe('Project Package Configuration'),
+  manifest: ManifestSchema.optional().describe('Project Package Configuration'),
   datasources: z.array(DatasourceSchema).optional().describe('External Data Connections'),
   translations: z.array(TranslationBundleSchema).optional().describe('I18n Translation Bundles'),
   i18n: TranslationConfigSchema.optional().describe('Internationalization configuration'),