feat(ai): 打通 SEO 闭环与投稿写作辅助

对齐 Zibll 的 AI 生成 SEO 流程：统一 WP AI Client/主题 Provider 双后端、文章/分类 SEO 框与生成回填、投稿摘要/标签建议，并收敛扩展页为连接配置。

templates/pages/page-submit.php

@@ -127,7 +127,10 @@ $current_thumb   = $edit_post ? get_the_post_thumbnail_url($edit_post->ID, 'larg
 
 			<?php if (!empty($submit_settings['allow_excerpt'])) : ?>
 			<div class="aksrt-form-group">
-				<label for="submit-excerpt"><?php esc_html_e('摘要', 'aksrt'); ?></label>
+				<label for="submit-excerpt">
+					<?php esc_html_e('摘要', 'aksrt'); ?>
+					<button type="button" class="aksrt-ai-assist-btn" data-ai-action="summary" hidden><?php esc_html_e('AI 生成摘要', 'aksrt'); ?></button>
+				</label>
 				<textarea id="submit-excerpt" name="excerpt" class="aksrt-form-input" rows="3" maxlength="300" placeholder="<?php esc_attr_e('可选：文章摘要', 'aksrt'); ?>"><?php echo esc_textarea($current_excerpt); ?></textarea>
 			</div>
 			<?php endif; ?>
@@ -147,7 +150,10 @@ $current_thumb   = $edit_post ? get_the_post_thumbnail_url($edit_post->ID, 'larg
 
 				<?php if (!empty($submit_settings['allow_tags'])) : ?>
 				<div class="aksrt-form-group aksrt-submit-form__col">
-					<label for="submit-tags"><?php esc_html_e('标签', 'aksrt'); ?></label>
+					<label for="submit-tags">
+						<?php esc_html_e('标签', 'aksrt'); ?>
+						<button type="button" class="aksrt-ai-assist-btn" data-ai-action="tags" hidden><?php esc_html_e('AI 建议标签', 'aksrt'); ?></button>
+					</label>
 					<input type="text" id="submit-tags" name="tags" class="aksrt-form-input" placeholder="<?php esc_attr_e('多个标签用逗号分隔', 'aksrt'); ?>" value="<?php echo esc_attr($current_tags); ?>">
 				</div>
 				<?php endif; ?>
@@ -274,10 +280,18 @@ if (file_exists($front_submit_path)) {
 		(string) filemtime($front_submit_path),
 		true
 	);
+	$ai_available = class_exists('AKSRT_AI') && AKSRT_AI::get_instance()->is_available();
 	wp_localize_script('aksrt-front-submit', 'aksrtSubmitData', [
-		'ajaxUrl' => admin_url('admin-ajax.php'),
-		'nonce'   => wp_create_nonce('aksrt_submit_nonce'),
-		'i18n'    => [
+		'ajaxUrl'   => admin_url('admin-ajax.php'),
+		'nonce'     => wp_create_nonce('aksrt_submit_nonce'),
+		'restUrl'   => esc_url_raw(rest_url('aksrt/v1')),
+		'restNonce' => wp_create_nonce('wp_rest'),
+		'ai'        => [
+			'available' => $ai_available,
+			'summary'   => $ai_available,
+			'tags'      => $ai_available,
+		],
+		'i18n'      => [
 			'confirmLeave'   => __('你有未保存的更改，确定要离开吗？', 'aksrt'),
 			'saving'         => __('保存中...', 'aksrt'),
 			'saved'          => __('草稿已保存', 'aksrt'),
@@ -285,6 +299,10 @@ if (file_exists($front_submit_path)) {
 			'submitted'      => __('投稿已提交', 'aksrt'),
 			'error'          => __('操作失败，请重试', 'aksrt'),
 			'confirmDelete'  => __('确定要删除这个草稿吗？', 'aksrt'),
+			'aiGenerating'   => __('生成中…', 'aksrt'),
+			'aiFailed'       => __('AI 生成失败', 'aksrt'),
+			'needContent'    => __('请先填写正文内容', 'aksrt'),
+			'aiFilled'       => __('已填入，可继续编辑', 'aksrt'),
 		],
 	]);
 }