click_captcha
gen click captcha
run ./test.sh , see ../target/img
前端代码参考
https://github.com/3tieto/click_captcha_demo_site/blob/main/src/captcha.coffee
后端代码参考
https://github.com/3tieto/click_captcha_demo_srv/blob/main/rust/i18n-rust-api/src/db/captcha.rs