fix: 修复登出按钮无效 — 同时清除磁盘 cookie 和浏览器内存 context

- BrowserManager 新增 clearContext() 方法，关闭并丢弃平台 context
- deleteCookies 同时调用 cookieStore.delete + browser.clearContext
- 前端登出后直接 resetStatus，不再触发浏览器请求检查状态

src/browser/manager.ts

@@ -193,6 +193,21 @@ export class BrowserManager {
     logger.debug({ platform }, 'Cookies saved');
   }
 
+  /**
+   * Close and discard the browser context for a platform so the next
+   * operation creates a fresh one (without any cookies or storage).
+   */
+  async clearContext(platform: string): Promise<void> {
+    const ctx = this.contexts.get(platform);
+    if (!ctx) return;
+
+    this.contexts.delete(platform);
+    await ctx.close().catch((err: unknown) => {
+      logger.warn({ err, platform }, 'Error closing context during clearContext');
+    });
+    logger.info({ platform }, 'Browser context cleared');
+  }
+
   /**
    * Wait for every in-flight platform queue to settle. Useful during
    * graceful shutdown so that running operations finish before teardown.

src/platforms/xiaohongshu/login.ts

@@ -140,15 +140,13 @@ export async function getLoginQRCode(
 // ---------------------------------------------------------------------------
 
 /**
- * Delete persisted cookies for the Xiaohongshu platform.
- *
- * @param _browser - The shared BrowserManager instance (unused for now but
- *                   passed for consistency; a future version may also clear
- *                   the in-memory browser context).
+ * Delete persisted cookies and clear the in-memory browser context so the
+ * next operation starts with a clean session.
  */
-export async function deleteCookies(_browser: BrowserManager): Promise<void> {
+export async function deleteCookies(browser: BrowserManager): Promise<void> {
   await cookieStore.delete(PLATFORM);
-  log.info('Xiaohongshu cookies deleted');
+  await browser.clearContext(PLATFORM);
+  log.info('Xiaohongshu cookies deleted and browser context cleared');
 }
 
 // ---------------------------------------------------------------------------