strip: remove pattern/surge/chat alert monitoring + unused commands

- delete services/{patternChecker,patternStore,surgeChecker,chatAlertChecker,staffNotifications,staffChannel,notificationRegistry,notificationEnabled,staffPresence}.js
- remove /notification, /staffnotification, /tag, /priority
- /escalate: drop action param, always unclaim
- purge PATTERN_*, SURGE_*, CHAT_ALERT_*, STAFF_* env vars from config + .env.example
- drop StaffNotification model
- ~2500 LOC removed
- settings-site /internal/notifications/* endpoints gone (UI will 404 until trimmed)

utils.js

@@ -3,7 +3,7 @@
  * priority helpers, template variables.
  */
 const crypto = require('crypto');
-const { CONFIG, GAME_NAMES, GAME_ALIASES, TICKET_TAGS } = require('./config');
+const { CONFIG, GAME_NAMES, GAME_ALIASES } = require('./config');
 
 /** Constant-time string compare. Returns false for mismatched length or empty/nullish inputs without throwing. */
 function safeEqual(a, b) {
@@ -243,13 +243,6 @@ function getPriorityColor(priority) {
   }
 }
 
-/** Returns emoji for a ticket-tag key (e.g. server-down → ⬇️). Priority always comes first in channel name, then tag. */
-function getTicketTagEmoji(tagKey) {
-  if (!tagKey) return '';
-  const t = (TICKET_TAGS || []).find(x => x.value === tagKey);
-  return t ? t.emoji : '';
-}
-
 // --- TEMPLATE VARIABLES ---
 
 function replaceVariables(template, context = {}) {
@@ -407,6 +400,5 @@ module.exports = {
   detectGame,
   getPriorityEmoji,
   getPriorityColor,
-  getTicketTagEmoji,
   replaceVariables
 };