fix: Re-export HttpMethod and FieldMappingSchema to fix test failures

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

Author: Copilot

packages/spec/src/api/router.zod.ts

@@ -1,6 +1,9 @@
 import { z } from 'zod';
 import { CorsConfigSchema, StaticMountSchema, HttpMethod } from '../shared/http.zod';
 
+// Re-export HttpMethod for convenience
+export { HttpMethod };
+
 /**
  * Route Category Enum
  * Classifies routes for middleware application and security policies.

packages/spec/src/data/external-lookup.zod.ts

@@ -245,3 +245,7 @@ export const ExternalLookupSchema = z.object({
 export type ExternalLookup = z.infer<typeof ExternalLookupSchema>;
 export type ExternalDataSource = z.infer<typeof ExternalDataSourceSchema>;
 export type ExternalFieldMapping = z.infer<typeof ExternalFieldMappingSchema>;
+
+// Re-export ExternalFieldMappingSchema as FieldMappingSchema for backward compatibility with tests
+export { ExternalFieldMappingSchema as FieldMappingSchema };
+export type FieldMapping = ExternalFieldMapping;