Add pluggable email provider system supporting SMTP, Mailgun, and SendGrid
with factory pattern for runtime provider selection. Includes branded HTML
email templates for verification, password reset, MFA notifications, and
organization invites.
Also rebrands all email content from Gatehouse to Secuird, adds email
provider configuration options, and fixes duplicate log handlers in
development mode.
Refractor Codes into sub file/folders
Admin can remove users'/members mfa/2fa, unlink account from oauth provider
Admin can add/reset password
Different Email (OIDC + Manual)-Same Account; (Block Linking and authorize if available)