feat: add clean button

README.md

@@ -77,6 +77,8 @@ The Posts and Pages lists show a status column for every target language, includ
 
 The Settings page also shows a live progress panel. It refreshes every five seconds and counts completed post/page and category/tag items for every configured target language. When **重新翻译所有内容** starts a batch, progress resets and counts only translations completed after that batch began, so historical translations do not make a new batch appear complete. Forced retranslation jobs are scheduled one minute apart, so a single WP-Cron request processes at most one batch item instead of timing out while processing every post. Progress reads only local WordPress and translation-table data; it does not send additional requests to Baidu.
 
+The **清除已翻译的缓存** action deletes every persisted translation, cancels pending translation jobs, and resets batch progress. The front end then falls back to source content until translations are explicitly queued again; regenerating them consumes Baidu API quota.
+
 ## Known Limitations
 
 - The settings UI accepts language codes but does not yet validate them against a maintained Baidu language-code list.

README.zh-CN.md

@@ -76,6 +76,8 @@ find . -path './.git' -prune -o -type f -name '*.php' -print0 | xargs -0 -n1 php
 
 设置页还显示实时进度面板。面板每五秒刷新一次，统计每种已配置目标语言中完成的文章/页面和分类/标签项目。当 **重新翻译所有内容** 启动批处理时，进度会重置，仅统计该批处理开始后完成的翻译，因此历史翻译不会让新的批处理看似已完成。强制重翻任务会按一分钟间隔排队，单次 WP-Cron 请求最多处理一个内容项，避免一次处理全部文章而超时。进度只读取本地 WordPress 和翻译表数据，不会发送额外请求。
 
+设置页的 **清除已翻译的缓存** 会删除所有持久化翻译记录、取消待执行的翻译任务并重置进度。清除后前台将显示源文，需使用相应翻译操作重新生成翻译；重新生成会再次消耗百度 API 配额。
+
 ## 已知限制
 
 - 设置界面接受语言代码，但尚未依据维护中的百度语言代码列表进行验证。

includes/class-wpt-admin.php

@@ -7,6 +7,7 @@ class WPT_Admin {
 		add_action( 'admin_menu', array( $this, 'add_settings_page' ) );
 		add_action( 'admin_init', array( $this, 'register_settings' ) );
 		add_action( 'admin_post_wpt_queue_existing_translations', array( $this, 'queue_existing_translations' ) );
+		add_action( 'admin_post_wpt_clear_translation_cache', array( $this, 'clear_translation_cache' ) );
 		add_action( 'admin_post_wpt_translate_post', array( $this, 'queue_post_translation' ) );
 		add_action( 'wp_ajax_wpt_translation_progress', array( $this, 'translation_progress' ) );
 		add_filter( 'manage_post_posts_columns', array( $this, 'add_translation_column' ) );
@@ -91,6 +92,14 @@ class WPT_Admin {
 				<?php submit_button( '翻译所有分类标签', 'secondary', 'submit', false ); ?>
 			</form>
 			<hr />
+			<h2>翻译缓存</h2>
+			<p>清除后，前台会暂时显示源文；重新翻译时将再次调用百度翻译 API。</p>
+			<form action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" method="post" onsubmit="return window.confirm('这将删除所有已保存的翻译、取消待执行翻译任务并重置进度。确认继续吗？');">
+				<input type="hidden" name="action" value="wpt_clear_translation_cache" />
+				<?php wp_nonce_field( 'wpt_clear_translation_cache' ); ?>
+				<?php submit_button( '清除已翻译的缓存', 'delete', 'submit', false ); ?>
+			</form>
+			<hr />
 			<h2>翻译进度</h2>
 			<div id="wpt-translation-progress" aria-live="polite">
 				<p>正在读取翻译进度...</p>
@@ -193,6 +202,27 @@ class WPT_Admin {
 		exit;
 	}
 
+	public function clear_translation_cache() {
+		if ( ! current_user_can( 'manage_options' ) ) {
+			wp_die( '您没有执行此操作的权限。' );
+		}
+
+		check_admin_referer( 'wpt_clear_translation_cache' );
+		$deleted = ( new WPT_Translation_Store() )->clear();
+
+		if ( false === $deleted ) {
+			wp_die( '翻译缓存清除失败。' );
+		}
+
+		wp_clear_scheduled_hook( 'wpt_process_translation' );
+		wp_clear_scheduled_hook( 'wpt_process_term_translation' );
+		wp_clear_scheduled_hook( 'wpt_process_seo_output_translation' );
+		delete_option( 'wpt_retranslation_batch' );
+
+		wp_safe_redirect( add_query_arg( 'wpt_cache_cleared', 1, admin_url( 'options-general.php?page=wp-btranslate' ) ) );
+		exit;
+	}
+
 	private function clear_scheduled_event( $hook, $args ) {
 		while ( false !== ( $timestamp = wp_next_scheduled( $hook, $args ) ) ) {
 			wp_unschedule_event( $timestamp, $hook, $args );

includes/class-wpt-translation-store.php

@@ -70,6 +70,12 @@ class WPT_Translation_Store {
 		);
 	}
 
+	public function clear() {
+		global $wpdb;
+
+		return $wpdb->query( 'DELETE FROM ' . self::table_name() );
+	}
+
 	public function get_post_language_status( $post_id, $target_language ) {
 		global $wpdb;