Add baseUrl parsing to avoid false "CSRF protected" error

[manchakkay]

It would be great to implement trimming and work with the trailing slash to avoid false positives of the "CSRF protected" error.

authjs-nuxt/packages/authjs-nuxt/src/runtime/utils.ts

Line 32 in 95a3136

if (serverOrigin !== requestOrigin)

I spent some time searching for the error and as I see in discussions there are people like me. Some documentation on authorization and specifying URLs use slashes at the end, so you can accidentally stumble upon a block due to a mismatch of origins.

Related discussions & issues:
#97
#75