refactor(settings): collapse get_all to aksrt_settings and drop migration UI

Make aksrt_settings the sole theme settings store for get_all(), remove
aksrt_seo_settings/aksrt_basic_settings merge paths, point global.logo
schema at aksrt_settings, and delete the retired settings migration page,
route, REST endpoint, and related SPA surface.

inc/classes/admin/class-aksrt-admin-import-export-controller.php

@@ -71,13 +71,6 @@ class AKSRT_Admin_Import_Export_Controller extends AKSRT_Admin_Controller_Base {
             'permission_callback' => [$this, 'check_permission'],
         ]);
 
-        // Migration status
-        register_rest_route(self::API_NAMESPACE, '/settings/migration-status', [
-            'methods'             => 'GET',
-            'callback'            => [$this, 'rest_migration_status'],
-            'permission_callback' => [$this, 'check_permission'],
-        ]);
-
         // Schema introspection (for frontend to discover available fields)
         register_rest_route(self::API_NAMESPACE, '/settings/schema/(?P<domain>[a-z_]+)', [
             'methods'             => 'GET',
@@ -401,8 +394,4 @@ class AKSRT_Admin_Import_Export_Controller extends AKSRT_Admin_Controller_Base {
 
         return $this->success(['checks' => $checks]);
     }
-
-    /**
-     * Migration status — reports schema version and pending migrations.
-     */
 }

inc/classes/admin/import-export-traits/trait-aksrt-admin-import-export-controller-part-1.php

@@ -3,17 +3,6 @@ defined('ABSPATH') || exit;
 
 trait AKSRT_Admin_Import_Export_Controller_Part_1 {
 
-    public function rest_migration_status(WP_REST_Request $request): WP_REST_Response {
-        // Settings migration UI/runtime has been removed. Keep the route for old SPA chunks
-        // until the next full admin rebuild, but return an empty retired payload.
-        return $this->success([
-            'schema_version' => get_option('aksrt_db_schema_version', '0.0.0'),
-            'migration_version' => 'retired',
-            'migration_log'  => [],
-            'retired' => true,
-        ]);
-    }
-
     /**
      * Get the schema definition for a domain (for frontend introspection).
      */

inc/classes/admin/schema/class-aksrt-admin-schema-global.php

@@ -43,7 +43,7 @@ class AKSRT_Admin_Schema_Global {
                     'key'        => 'logo',
                     'title'      => 'LOGO图像',
                     'version'    => '1.0.0',
-                    'option_key' => 'aksrt_seo_settings',
+                    'option_key' => 'aksrt_settings',
                     'groups'     => [
                         ['key' => 'logo', 'title' => 'Logo 设置', 'fields' => [
                             ['key' => 'site_logo', 'label' => '站点 Logo', 'type' => 'media', 'default' => ''],

inc/classes/admin/schema/class-aksrt-admin-schema-tools-migration.php

@@ -1,27 +0,0 @@
-<?php
-/**
- * AKSRT_Admin_Schema_Tools_Migration section schema.
- *
- * @package AKSRT
- */
-
-defined('ABSPATH') || exit;
-
-class AKSRT_Admin_Schema_Tools_Migration {
-
-    public static function build(): array {
-        return [
-            'key'        => 'migration',
-            'title'      => '数据迁移',
-            'version'    => '1.0.0',
-            'option_key' => 'aksrt_settings',
-            'groups'     => [
-                ['key' => 'status', 'title' => '迁移状态', 'fields' => [
-                    ['key' => 'current_version', 'label' => '当前版本', 'type' => 'display'],
-                    ['key' => 'pending_migrations', 'label' => '待执行迁移', 'type' => 'display'],
-                    ['key' => 'run_migration', 'label' => '执行迁移', 'type' => 'button', 'help' => '手动触发数据库迁移'],
-                ]],
-            ],
-        ];
-    }
-}