Add real replacement pages for Pages, Media Library, and Users (v2.6.0)

Completes the "skinned vs. replaced" conversion started with Posts —
every native list-table screen the user asked about now has a genuine
custom Vue page behind it instead of dark-themed CSS over the native
markup. All three follow the same pattern as Posts: own REST controller
in admin/src/Rest/, own Vue page matching the Comments layout, native
screen redirected away (direct visits too, not just the sidebar link),
gated by its own Settings toggle defaulting to on.

- Pages (PagesData.php + Pages.vue): same as Posts, parent page shown
  instead of categories. edit.php?post_type=page redirects; other post
  types untouched.
- Media Library (MediaData.php + Media.vue): thumbnail grid with type
  filters (Images/Audio/Video/Documents/Unattached). Replaces the
  browse/library experience only — media-new.php (the actual upload
  screen) is untouched, same reasoning as leaving the block editor
  alone for Posts/Pages.
- Users (UsersData.php + Users.vue): filterable by role. Deleting a
  user always reassigns their content to whoever performs the deletion
  rather than exposing WP core's reassign-or-delete-everything choice
  as a one-click action — deliberately simplified to avoid a surprising,
  highly destructive default. user-new.php untouched.

Verified live: Media's grid renders real thumbnails/dimensions/file
sizes with working filters and search; Users shows real accounts with
role filters and correctly hides delete for the current user; both
redirect correctly from their native URLs.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

app/src/entries/media.js

@@ -0,0 +1,10 @@
+import { createApp } from 'vue';
+import '@/shell/shell-frame.css';
+import Media from '@/pages/media/Media.vue';
+
+const mountEl = document.getElementById('aurora-admin-media-root');
+
+if (mountEl) {
+  const data = JSON.parse(mountEl.dataset.auroraAdmin || '{}');
+  createApp(Media, { serverData: data }).mount(mountEl);
+}

app/src/entries/pages.js

@@ -0,0 +1,10 @@
+import { createApp } from 'vue';
+import '@/shell/shell-frame.css';
+import Pages from '@/pages/pages/Pages.vue';
+
+const mountEl = document.getElementById('aurora-admin-pages-root');
+
+if (mountEl) {
+  const data = JSON.parse(mountEl.dataset.auroraAdmin || '{}');
+  createApp(Pages, { serverData: data }).mount(mountEl);
+}

app/src/entries/users.js

@@ -0,0 +1,10 @@
+import { createApp } from 'vue';
+import '@/shell/shell-frame.css';
+import Users from '@/pages/users/Users.vue';
+
+const mountEl = document.getElementById('aurora-admin-users-root');
+
+if (mountEl) {
+  const data = JSON.parse(mountEl.dataset.auroraAdmin || '{}');
+  createApp(Users, { serverData: data }).mount(mountEl);
+}