Fix api-tokens date display + quiet authIO no-token log (#36)

- api_tokens.ejs: created_on/last_used_on come back from Redis as strings
  (model-redis only coerces fields with an explicit `type`), so `new Date(ms)`
  yielded "Invalid date". Use `moment(ms, "x")` (the hosts.ejs/dns.ejs
  precedent) which parses a numeric string-or-number as a Unix-ms timestamp.
- api_tokens.ejs: `isExpired` is a class getter not serialized to the client
  JSON, so the "expired" badge never showed — compute expiry in the view via
  `Date.now() > Number(expires_at)`. Also guard the `last_used_on: 0` / falsy
  case (string "0" is truthy) so unset timestamps render "—" not "1970".
- middleware/auth.js: authIO did `checkToken(socket.handshake.auth.token || 0)`,
  so any socket connect without a token (login page, pre-login) did an
  `AuthToken.get(0)` lookup and logged a noisy `EntryNotFound` trace. Guard:
  reject the socket with a generic 401 when there's no token (behavior-
  preserving — unauth sockets were already rejected; just no Redis lookup / 404).

Co-authored-by: Claude <noreply@anthropic.com>

nodejs/middleware/auth.js

@@ -30,7 +30,12 @@ async function auth(req, res, next){
 
 async function authIO(socket, next){
 	try{
-		let token = await Auth.checkToken(socket.handshake.auth.token || 0);
+		// No token in the handshake (e.g. a page hit before login, or a socket
+		// opened while logged out) → reject the socket cleanly without doing an
+		// AuthToken.get(0) lookup that throws a noisy EntryNotFound trace.
+		let tok = socket.handshake.auth && socket.handshake.auth.token;
+		if(!tok) return next(Auth.errors.login());
+		let token = await Auth.checkToken(tok);
 		socket.user = await token.getUser();
 		next();
 	}catch(error){