- Add /api/captcha endpoint with captcha generation/verification service
- Add captcha_enabled option in system settings (model/option.go)
- Add captcha display and refresh logic in LoginForm
- Fix captcha not showing on Chrome due to Semi UI Form.Input suffix
incompatibility; refactored to standalone flex layout
- Fix stale localStorage cache preventing captcha rendering on first visit
by proactively fetching /api/status on LoginForm mount
- Add captcha_enabled toggle in admin SystemSetting panel
- Add i18n keys for captcha-related text (zh-CN, en)
xiezhouwei