fix(encryptid): use CONFIG.smtp.from for OIDC verification emails

The sendVerificationEmail function was hardcoding noreply@ridentity.online
as the sender, but SMTP authenticates as noreply@rspace.online. Mailcow
rejected the mismatch with 553 "Sender address rejected: not owned by user".

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

src/encryptid/server.ts

@@ -283,7 +283,7 @@ async function sendVerificationEmail(to: string, token: string, username: string
   }
 
   await smtpTransport.sendMail({
-    from: 'EncryptID <noreply@ridentity.online>',
+    from: CONFIG.smtp.from,
     to,
     subject: 'rIdentity — Verify your email address',
     text: [