SMTP: extend env parsing (domain/auth/starttls); add unit test with mocked TLS for sendSmtpMail; extend SmtpConfig; docs to set .env locally

src/server/email-smtp.ts

@@ -6,6 +6,7 @@ type SmtpConfig = {
   username: string
   password: string
   from: string
+  tls?: boolean
 }
 
 function b64(input: string) {
@@ -66,4 +67,3 @@ export async function sendSmtpMail(cfg: SmtpConfig, to: string, subject: string,
     socket.on("error", reject)
   })
 }
-