Feature: Disable email verification

Added an env variable (MAIL_ENABLE) that will disable any email sending and functions like verification. With this enabled, signing up will automatically mark the account as verified and sign them in, skipping the verify step.

Did this so I can develop entirely locally and without internet, I’m on holiday in the Outer Hebrides where internet isn’t great. Writing this on a 7 hour ferry 🫩

Also changed the flags field from bigint -> integer to save space, I won’t need 64 bits)

1. Disable Email Verification
2. Fix silliness