Suppress environment prefix in email subjects on Production

[ENV_NAME] prefix is now only prepended in non-production environments
(Development, Staging, etc.). Production emails get a clean subject line.

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

Apis/email-api/Services/SmtpEmailDispatcher.cs

@@ -58,7 +58,9 @@ public sealed class SmtpEmailDispatcher
         if (!string.IsNullOrWhiteSpace(req.ReplyTo))
             msg.ReplyTo.Add(MailboxAddress.Parse(req.ReplyTo));
 
-        msg.Subject = $"[{_environmentName}] {req.Subject}".Trim();
+        msg.Subject = string.Equals(_environmentName, "Production", StringComparison.OrdinalIgnoreCase)
+            ? req.Subject.Trim()
+            : $"[{_environmentName}] {req.Subject}".Trim();
 
         var shellStart = _templates.Get("email.html-shell.start", "*");
         var shellEnd = _templates.Get("email.html-shell.end", "*");