docs: 补充 v1.2.7 登录验证（滑块 / Turnstile / Cap）文档

README.en.md

@@ -42,7 +42,7 @@
 ## Features
 
 - **Drag, click, or Ctrl+V paste** — server-side WebP, Referer hotlink protection
-- **Multi-user** — login with slider captcha, optional registration; users see only their images
+- **Multi-user** — login with slider, Turnstile, or Cap verification; optional registration; users see only their images
 - **Multi-backend storage** — local disk + S3-compatible (R2 / COS / OSS / AWS); hybrid `proxy` / `public` URLs
 - **Gallery** — browse, search, filter by storage/source, grid/list views, batch delete; stats overview and source breakdown
 - **API & Twikoo** — global / per-user tokens; `POST /api/index.php` compatible