refactor: reorganize package exports under namespaced paths

- Prefix feature exports with `features/` (auth, admin, provider)
- Prefix shared exports with `shared/` (components, icons, lib, config, logger, rate-limit)
- Add new explicit exports for `shared/logger`, `shared/config`, and `shared/rate-limit`
- Update internal imports to use package self-referencing (`@zen/core/shared/*`) instead of relative paths

src/features/admin/actions.js

@@ -4,7 +4,7 @@
  * Exported separately from admin/index.js to avoid bundling
  * server-side code (which includes database imports) into client components.
  *
- * Usage: import { getDashboardStats } from '@zen/core/admin/actions';
+ * Usage: import { getDashboardStats } from '@zen/core/features/admin/actions';
  */
 
 export { getDashboardStats } from './actions/statsActions.js';

src/features/admin/actions/statsActions.js

@@ -6,9 +6,9 @@
  *
  * ```javascript
  * // app/(admin)/admin/[...admin]/page.js
- * import { protectAdmin } from '@zen/core/admin';
- * import { getDashboardStats } from '@zen/core/admin/actions';
- * import { AdminPagesClient } from '@zen/core/admin/pages';
+ * import { protectAdmin } from '@zen/core/features/admin';
+ * import { getDashboardStats } from '@zen/core/features/admin/actions';
+ * import { AdminPagesClient } from '@zen/core/features/admin/pages';
  *
  * export default async function AdminPage({ params }) {
  *   const { user } = await protectAdmin();
@@ -30,7 +30,7 @@
 'use server';
 
 import { query } from '@zen/core/database';
-import { fail } from '../../../shared/lib/logger.js';
+import { fail } from '@zen/core/shared/logger';
 
 /**
  * Get total number of users

src/features/admin/components/AdminHeader.js

@@ -3,7 +3,7 @@
 import React from 'react';
 import { Menu, Transition } from '@headlessui/react';
 import { Fragment } from 'react';
-import { ChevronDownIcon } from '../../../shared/Icons.js';
+import { ChevronDownIcon } from '@zen/core/shared/icons';
 import { useRouter } from 'next/navigation';
 import ThemeToggle from './ThemeToggle';
 

src/features/admin/components/AdminSidebar.js

@@ -3,8 +3,8 @@
 import React, { useState, useEffect } from 'react';
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
-import * as Icons from '../../../shared/Icons.js';
-import { ChevronDownIcon } from '../../../shared/Icons.js';
+import * as Icons from '@zen/core/shared/icons';
+import { ChevronDownIcon } from '@zen/core/shared/icons';
 
 /**
  * Resolve icon name (string) to icon component

src/features/admin/components/ThemeToggle.js

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState, useEffect } from 'react';
-import { Sun01Icon, Moon02Icon, SunCloud02Icon, MoonCloudIcon } from '../../../shared/Icons.js';
+import { Sun01Icon, Moon02Icon, SunCloud02Icon, MoonCloudIcon } from '@zen/core/shared/icons';
 
 function getNextTheme(current) {
     const systemIsDark = window.matchMedia('(prefers-color-scheme: dark)').matches;

src/features/admin/components/pages/DashboardPage.js

@@ -1,7 +1,7 @@
 'use client';
 
-import { StatCard } from '../../../../shared/components';
-import { UserMultiple02Icon } from '../../../../shared/Icons.js';
+import { StatCard } from '@zen/core/shared/components';
+import { UserMultiple02Icon } from '@zen/core/shared/icons';
 
 export default function DashboardPage({ user, stats }) {
   const loading = !stats;

src/features/admin/components/pages/ProfilePage.js

@@ -1,7 +1,7 @@
 'use client';
 
 import React, { useState, useEffect, useRef } from 'react';
-import { Card, Input, Button } from '../../../../shared/components';
+import { Card, Input, Button } from '@zen/core/shared/components';
 import { useToast } from '@zen/core/toast';
 
 const ProfilePage = ({ user: initialUser }) => {

src/features/admin/components/pages/UserEditPage.js

@@ -2,7 +2,7 @@
 
 import React, { useState, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
-import { Button, Card, Input, Select, Loading } from '../../../../shared/components';
+import { Button, Card, Input, Select, Loading } from '@zen/core/shared/components';
 import { useToast } from '@zen/core/toast';
 
 /**

src/features/admin/components/pages/UsersPage.js

@@ -2,8 +2,8 @@
 
 import React, { useState, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
-import { Card, Table, StatusBadge, Pagination, Button } from '../../../../shared/components';
-import { PencilEdit01Icon } from '../../../../shared/Icons.js';
+import { Card, Table, StatusBadge, Pagination, Button } from '@zen/core/shared/components';
+import { PencilEdit01Icon } from '@zen/core/shared/icons';
 import { useToast } from '@zen/core/toast';
 
 const UsersPageClient = () => {

src/features/admin/middleware/protect.js

@@ -3,7 +3,7 @@
  * Utilities to protect admin routes and require admin role
  */
 
-import { getSession } from '../../auth/actions/authActions.js';
+import { getSession } from '@zen/core/features/auth/actions';
 import { redirect } from 'next/navigation';
 
 /**
@@ -17,7 +17,7 @@ import { redirect } from 'next/navigation';
  * 
  * @example
  * // In a server component:
- * import { protectAdmin } from '@zen/core/admin';
+ * import { protectAdmin } from '@zen/core/features/admin';
  * 
  * export default async function AdminPage() {
  *   const session = await protectAdmin();
@@ -47,7 +47,7 @@ async function protectAdmin(options = {}) {
  * @returns {Promise<boolean>} True if user is admin
  * 
  * @example
- * import { isAdmin } from '@zen/core/admin';
+ * import { isAdmin } from '@zen/core/features/admin';
  * 
  * export default async function Page() {
  *   const admin = await isAdmin();

src/features/admin/page.js

@@ -2,14 +2,14 @@
  * Admin Page - Server Component Wrapper for Next.js App Router
  *
  * Re-export this in your app/admin/[...admin]/page.js:
- * export { default } from '@zen/core/admin/page';
+ * export { default } from '@zen/core/features/admin/page';
  */
 
-import { AdminPagesLayout, AdminPagesClient } from '@zen/core/admin/pages';
-import { protectAdmin } from '@zen/core/admin';
-import { buildNavigationSections } from '@zen/core/admin/navigation';
-import { getDashboardStats } from '@zen/core/admin/actions';
-import { logoutAction } from '@zen/core/auth/actions';
+import { AdminPagesLayout, AdminPagesClient } from '@zen/core/features/admin/pages';
+import { protectAdmin } from '@zen/core/features/admin';
+import { buildNavigationSections } from '@zen/core/features/admin/navigation';
+import { getDashboardStats } from '@zen/core/features/admin/actions';
+import { logoutAction } from '@zen/core/features/auth/actions';
 import { getAppName } from '@zen/core';
 
 export default async function AdminPage({ params }) {