Template Name: Email Verification
Trigger: Registration (POST /api/auth/register) + Login mit unverified Email (POST /api/auth/login) + Resend (POST /api/auth/resend-verification)
From: Konfiguriert via SMTP_FROM env var
Subject: Verify your LeanCTX account
Link expires: 24 hours

---

Welcome to LeanCTX!

Please verify your email address:

{{link}}

This link expires in 24 hours.

---

Variables:
  {{link}} = {API_BASE_URL}/api/auth/verify-email?token={token}
             Beispiel: https://api.leanctx.com/api/auth/verify-email?token=abc123...

Redirect nach Klick: {PUBLIC_BASE_URL}/login?verified=true
                     Beispiel: https://leanctx.com/login?verified=true
