Fix S3/SMTP connectivity and add one-click invite flow

- Fix MinIO port parsing bug: use protocol-appropriate defaults (443/80)
  instead of hardcoded 9000 fallback, enabling public URL endpoint
- Remove unused SMTP server config from NextAuth EmailProvider to prevent
  connection errors (sendVerificationRequest is fully overridden)
- Replace extra_hosts with DNS config (8.8.8.8) so container resolves
  mail.monaco-opc.com to public IP instead of host loopback
- Add invite token auth: single-click accept-invite flow replacing broken
  two-email invitation process
- Auto-send invitation emails on bulk user creation
- Update email template expiry text from 24 hours to 7 days

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib/minio.ts

@@ -17,7 +17,7 @@ function createMinioClient(): Minio.Client {
 
   return new Minio.Client({
     endPoint: url.hostname,
-    port: parseInt(url.port) || 9000,
+    port: url.port ? parseInt(url.port) : (url.protocol === 'https:' ? 443 : 80),
     useSSL: url.protocol === 'https:',
     accessKey: process.env.MINIO_ACCESS_KEY || 'minioadmin',
     secretKey: process.env.MINIO_SECRET_KEY || 'minioadmin',