chore(release): public-release readiness and security fixes for 1.1.16

Security:
- Escape user-supplied values in LDAP filters and DNs (group_ldap.js, user_ldap.js)
- Replace Math.random() token/UUID/OTP generation with crypto.randomUUID / crypto.randomInt
- Refuse startup when oauth.jwtSecret is missing or placeholder

Fixes:
- Correct from-address template rendering in email.js

Packaging:
- Remove private flag and bump version to 1.1.16

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

nodejs/models/email.js

@@ -58,7 +58,7 @@ Mail.sendTemplate = async function(to, template, context, from){
 		to,
 		mustache.render(template.subject, context),
 		mustache.render(template.message, context),
-		from || (template.from && mustache.render(template.message, context))
+		from || (template.from && mustache.render(template.from, context))
 	)
 };