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/features/admin/navigation.server.js

@@ -7,16 +7,16 @@
  * IMPORTANT: This file is NOT bundled to ensure it shares the same registry instance
  * that was populated during module discovery.
  * 
- * IMPORTANT: We import from '@hykocx/zen' (main package) to use the same registry
+ * IMPORTANT: We import from '@zen/core' (main package) to use the same registry
  * instance that was populated during initializeZen(). DO NOT import from 
- * '@hykocx/zen/core/modules' as that's a separate bundle with its own registry.
+ * '@zen/core/core/modules' as that's a separate bundle with its own registry.
  * 
  * IMPORTANT: Navigation data must be serializable (no functions/components).
  * Icons are passed as string names and resolved on the client.
  */
 
 // Import from the main package to use the same registry as discovery
-import { moduleSystem } from '@hykocx/zen';
+import { moduleSystem } from '@zen/core';
 const { getAllAdminNavigation } = moduleSystem;
 
 /**