chore: rename package from @hykocx/zen to @zen/core

Update all references across source files, documentation, and
configuration to reflect the new package scope and name. This includes
updating `.npmrc` registry config, install instructions, module
examples, and all import path comments throughout the codebase.

src/cli/setup.js

@@ -15,7 +15,7 @@ const templates = {
   instrumentation: `// instrumentation.js
 export async function register() {
   if (process.env.NEXT_RUNTIME === 'nodejs') {
-    const { initializeZen } = await import('@hykocx/zen');
+    const { initializeZen } = await import('@zen/core');
     await initializeZen();
   }
 }
@@ -26,7 +26,7 @@ export default function Redirect() {
   redirect('/auth/login/');
 }
 `,
-  authCatchAll: `export { default } from '@hykocx/zen/auth/page';
+  authCatchAll: `export { default } from '@zen/core/auth/page';
 `,
   adminRedirect: `import { redirect } from 'next/navigation';
 
@@ -34,11 +34,11 @@ export default function Redirect() {
   redirect('/admin/dashboard');
 }
 `,
-  adminCatchAll: `export { default } from '@hykocx/zen/admin/page';
+  adminCatchAll: `export { default } from '@zen/core/admin/page';
 `,
-  zenApiRoute: `export { GET, POST, PUT, DELETE, PATCH } from '@hykocx/zen/zen/api';
+  zenApiRoute: `export { GET, POST, PUT, DELETE, PATCH } from '@zen/core/zen/api';
 `,
-  zenPageRoute: `export { default, generateMetadata } from '@hykocx/zen/modules/page';
+  zenPageRoute: `export { default, generateMetadata } from '@zen/core/modules/page';
 `,
   nextConfig: `// next.config.js
 module.exports = {
@@ -144,7 +144,7 @@ async function setupZen(options = {}) {
   console.log('\n🎉 Setup complete!');
   console.log('\nNext steps:');
   console.log('  1. Add Zen styles to your globals.css:');
-  console.log('     @import \'@hykocx/zen/styles/zen.css\';');
+  console.log('     @import \'@zen/core/styles/zen.css\';');
   console.log('  2. Configure environment variables (see .env.example)');
   console.log('  3. Initialize the database:');
   console.log('     npx zen-db init');