Replace Resend env vars with SMTP config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -6,5 +6,8 @@ DB_PASSWORD="your_secure_password_here"
 NEXTAUTH_SECRET="generate-with-openssl-rand-base64-32"
 NEXTAUTH_URL="http://localhost:3000"
 
-# Resend (for magic link emails)
-RESEND_API_KEY="re_your_api_key_here"
+# SMTP Email (Mailcow)
+SMTP_HOST=mx.jeffemmett.com
+SMTP_PORT=587
+SMTP_USER=noreply@jeffemmett.com
+SMTP_PASS=changeme

docker-compose.yml

@@ -14,7 +14,10 @@ services:
       - DATABASE_URL=postgresql://rvote:${DB_PASSWORD}@postgres:5432/rvote
       - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
       - NEXTAUTH_URL=https://rvote.online
-      - RESEND_API_KEY=${RESEND_API_KEY}
+      - SMTP_HOST=${SMTP_HOST:-mx.jeffemmett.com}
+      - SMTP_PORT=${SMTP_PORT:-587}
+      - SMTP_USER=${SMTP_USER:-noreply@jeffemmett.com}
+      - SMTP_PASS=${SMTP_PASS}
       - ROOT_DOMAIN=rvote.online
       - NEXT_PUBLIC_ROOT_DOMAIN=rvote.online
     networks: