feat(i2v): enhance image-to-video documentation and single/dual frame support

feat: add auto-detection for headless environments and auto-switch captcha modes

feat: align with main branch

fork: 个人用途可以在内置浏览器上登录对应的谷歌账号，测试可行

feat: 无头打码与YesCaptcha打码

feat：flow2api初版