fix: skip email verification entirely when no mail transport exists

SMTP-less self-hosted instances still marked every account
emailVerified=false and attempted a verification mail that could
never arrive. Now: no transport → accounts are created verified,
the send is skipped, and existing unverified rows are backfilled
on startup. .env.example stops defaulting SMTP_HOST to the
dev-only mailpit service.

Verified live: fresh signup returns emailVerified=true, legacy
unverified users flip on restart, sign-in unaffected.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to Primora. Format follows [Keep a Changelog](https://keepac
 
 ## [Unreleased]
 
+### Fixed
+
+- **SMTP-less instances no longer involve email at all** — when no mail transport is configured (no Resend key, no `SMTP_HOST`), new accounts are created `emailVerified=true`, the verification send is skipped entirely, and existing unverified users are marked verified on startup. `.env.example` no longer defaults `SMTP_HOST` to the dev-only `mailpit` service, which left production deploys pointing at a transport that does not exist.
+
 ## [0.8.0] - 2026-09-28
 
 ### Added