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.

Generated with [Devin](https://devin.ai)

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

apps/auth/src/index.ts

@@ -5,7 +5,7 @@ import { requestId } from "hono/request-id";
 import { HTTPException } from "hono/http-exception";
 import { createClient } from "redis";
 
-import { auth, promoteAdminEmails, runAuthMigrations } from "./lib/auth.js";
+import { auth, promoteAdminEmails, runAuthMigrations, verifyUsersWithoutMailTransport } from "./lib/auth.js";
 import { authPool } from "./lib/db.js";
 import { env } from "./lib/env.js";
 
@@ -20,6 +20,7 @@ try {
 }
 
 await retry("auth_migrations", runAuthMigrations);
+await verifyUsersWithoutMailTransport();
 await promoteAdminEmails();
 
 const app = new Hono();