Add a real replacement Posts management page (v2.5.0)

Posts was previously just dark-themed skinning over the native
edit.php list table, unlike Comments/Plugins which are genuine
replacements. Built the same way: new PostsData.php REST controller
(list with status/search filters matching native tabs, trash, restore,
permanent delete) and a Vue page matching the Comments layout.

- SubApps.php registers it as aurora-admin-posts, parented under
  edit.php (same pattern as Plugins under plugins.php).
- redirect_native_pages() redirects direct edit.php visits (typed URL,
  not just the sidebar link) to the Aurora page — gated to the default
  post type only, so Pages and other custom post types are untouched.
- MenuSerializer rewrites the sidebar's Posts/All Posts links the same
  way Plugins/Comments already were.
- Gated by Settings > Posts' "Modern posts table" toggle, re-added now
  that it has a real implementation (it was removed a few commits ago
  for describing a feature that didn't exist).
- Fixed modern_plugins/modern_comments/modern_posts all defaulting to
  visually "on" in the Settings UI to match their actual PHP default.

Verified live: trash/restore/status filters/search all work correctly,
edit.php redirects to the Aurora page, edit.php?post_type=page (Pages)
correctly does not.

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

aurora-admin.php

@@ -3,7 +3,7 @@
  * Plugin Name: Aurora Admin
  * Plugin URI: https://aurora.co
  * Description: A modern, fast WordPress admin interface.
- * Version: 2.4.2
+ * Version: 2.5.0
  * Author: Aurora
  * Text Domain: aurora-admin
  * Domain Path: /languages/
@@ -14,7 +14,7 @@
 
 defined("ABSPATH") || exit();
 
-define("AURORA_ADMIN_VERSION", "2.4.2");
+define("AURORA_ADMIN_VERSION", "2.5.0");
 define("AURORA_ADMIN_PATH", plugin_dir_path(__FILE__));
 define("AURORA_ADMIN_URL", plugins_url("aurora-admin/"));
 
@@ -32,6 +32,7 @@ require AURORA_ADMIN_PATH . "admin/src/Analytics/Analytics.php";
 require AURORA_ADMIN_PATH . "admin/src/Rest/AnalyticsData.php";
 require AURORA_ADMIN_PATH . "admin/src/Rest/PluginsData.php";
 require AURORA_ADMIN_PATH . "admin/src/Rest/CommentsData.php";
+require AURORA_ADMIN_PATH . "admin/src/Rest/PostsData.php";
 require AURORA_ADMIN_PATH . "admin/src/Posts/ScheduledDayFilter.php";
 require AURORA_ADMIN_PATH . "admin/src/WhiteLabel/WhiteLabel.php";
 require AURORA_ADMIN_PATH . "admin/src/Pages/SubApps.php";