release: v1.2.1 — login captcha, docs site, and bug fixes

Add slider captcha for web login, VitePress documentation on GitHub Pages,
and fixes for gallery delete refresh, pagination jump, and copy-format persistence.

server/api/auth/captcha.get.ts

@@ -0,0 +1,6 @@
+import { createLoginCaptchaChallenge } from '../../utils/login-captcha'
+
+export default defineEventHandler(() => {
+  const { id, svg } = createLoginCaptchaChallenge()
+  return { id, svg }
+})