refactor(autoload): migrate theme classes to Composer PSR-4

Move 288 types from global AKSRT_* + inc/classes manual requires into
namespace AKSRT\{Domain} under src/AKSRT/, wire composer.json psr-4,
and slim bootstrap to helpers/modules/hooks only. Split multi-class
widget/gateway files, update admin contract audit paths, and document
the layout in ADR/README.

src/AKSRT/Forum/ViewBuilderPart2.php

@@ -0,0 +1,116 @@
+<?php
+/**
+ * @package AKSRT
+ */
+
+namespace AKSRT\Forum;
+
+defined('ABSPATH') || exit;
+
+trait ViewBuilderPart2 {
+
+
+    public function ajax_search_topics(): void {
+        $search = sanitize_text_field((string) ($_GET['q'] ?? $_POST['q'] ?? ''));
+        $limit  = min(50, max(5, (int) ($_GET['limit'] ?? 20)));
+
+        if (!taxonomy_exists('aksrt_forum_topic_cat')) {
+            wp_send_json_success([]);
+        }
+
+        $args = [
+            'taxonomy'   => 'aksrt_forum_topic_cat',
+            'hide_empty' => false,
+            'number'     => $limit,
+            'orderby'    => 'name',
+            'order'      => 'ASC',
+        ];
+        if ($search !== '') {
+            $args['search'] = $search;
+        }
+
+        $terms = get_terms($args);
+        $results = [];
+        if (!is_wp_error($terms)) {
+            foreach ($terms as $term) {
+                $results[] = ['id' => (int) $term->term_id, 'name' => (string) $term->name];
+            }
+        }
+
+        wp_send_json_success($results);
+    }
+
+    public function template_routing(string $template): string {
+        // Plate CPT single → board template
+        if (is_singular('aksrt_forum_plate')) {
+            $plate_template = AKSRT_DIR . '/templates/forum/forum-plate.php';
+            if (file_exists($plate_template)) {
+                return $plate_template;
+            }
+            $board_template = AKSRT_DIR . '/templates/forum/forum-board.php';
+            if (file_exists($board_template)) {
+                return $board_template;
+            }
+        }
+
+        // Plate category (分区) archive
+        if (is_tax('aksrt_plate_cat')) {
+            $cat_template = AKSRT_DIR . '/templates/forum/forum-plate-cat.php';
+            if (file_exists($cat_template)) {
+                return $cat_template;
+            }
+        }
+
+        if (is_tax('aksrt_forum_board')) {
+            $board_template = AKSRT_DIR . '/templates/forum/forum-board.php';
+            if (file_exists($board_template)) {
+                return $board_template;
+            }
+        }
+
+        if (is_tax('aksrt_forum_tag')) {
+            $tag_template = AKSRT_DIR . '/templates/forum/forum-tag.php';
+            if (file_exists($tag_template)) {
+                return $tag_template;
+            }
+        }
+
+        if (is_singular('aksrt_forum_topic')) {
+            if (isset($_GET['edit']) && $_GET['edit'] === '1') {
+                $edit_template = AKSRT_DIR . '/templates/forum/forum-edit.php';
+                if (file_exists($edit_template)) {
+                    return $edit_template;
+                }
+            }
+
+            $topic_template = AKSRT_DIR . '/templates/forum/forum-topic.php';
+            if (file_exists($topic_template)) {
+                return $topic_template;
+            }
+        }
+
+        return $template;
+    }
+
+    public function ajax_topic_list(): void {
+        $user_id = get_current_user_id();
+        if (!$this->forum->is_forum_admin($user_id)) {
+            wp_send_json_error(['message' => __('权限不足', 'aksrt')]);
+        }
+
+        $board_id = (int) ($_GET['board_id'] ?? 0);
+        $limit = max(1, min(100, (int) ($_GET['limit'] ?? 20)));
+        $view = $this->get_topic_list([
+            'board_id' => $board_id,
+            'limit' => $limit,
+            'status' => 'all',
+            'viewer_user_id' => get_current_user_id(),
+            'include_hidden' => true,
+        ]);
+
+        wp_send_json_success([
+            'topics' => $view['items'],
+            'stats' => $this->get_stats(),
+        ]);
+    }
+}