Item #4: centralize timezone, collapse the 16 pod branches to loops

- includes/db.php now defines PQS_TIMEZONE and sets it on include; the 9 files
  that hardcoded date_default_timezone_set('America/Chicago') drop the call
  (main pages already load db.php; display includes now require it).
- console.php: pod load and the 16 pod-checkbox lines collapsed into loops over
  a $pods array (fixed 16 kept - hardware max). Output unchanged.

Verified: timezone resolves to America/Chicago via the constant; console commit,
config update, and pod-checkbox rendering all correct; registration suite green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

registration.php

@@ -22,7 +22,6 @@ var auto_refreshqueue = setInterval(function() {
 include_once("includes/config.php");
 require_once("includes/db.php");
 require_once("includes/queue.php");
-date_default_timezone_set('America/Chicago');
 $tdate = date('Ymd');
 $ttime = date('Hi');
 $missionsize = $_SESSION['mechpods'];