simplify: prune dead code, dedup gmail send, drop neutered log stubs

- Remove no-op log stubs (logGmail, logAutomation, logSecurity, logSystem)
  and ~17 callsites; dead counters in tickets.js and gmail-poll.js go too
- Dedup three near-identical Gmail send paths into sendThreadedEmail helper
- Drop dead Mongoose fields: broccoliniTicketId, lastSyncedBroccoliniArticleId,
  renameCount, renameWindowStart, reminderSent, staffChannelId,
  unclaimedRemindersSent, lastMessageAuthorIsStaff
- Drop dead config fields and their .env.example entries
- Inline api/botClient.js (3-line wrapper, 2 callers)
- Trim unused exports across utils.js, tickets.js, configSchema.js, debugLog.js
- Fix handlers/messages.js to use isStaff() — old partial check ignored
  ADDITIONAL_STAFF_ROLES, so those members were treated as customers
- Drop unused deps p-queue + dotenv-expand; move mongodb to devDependencies

Net: -583 LOC source + -57 LOC lockfile. All 23 modules load clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

utils.js

@@ -173,31 +173,6 @@ function extractRawEmail(headerValue) {
   return match ? match[1].trim() : headerValue.trim();
 }
 
-// --- DATE ---
-
-const getFormattedDate = () => {
-  const now = new Date();
-  const datePart = now
-    .toLocaleDateString('en-US', {
-      month: '2-digit',
-      day: '2-digit',
-      year: 'numeric'
-    })
-    .replace(/\//g, '-');
-  const timePart = now.toLocaleTimeString('en-US', {
-    hour: '2-digit',
-    minute: '2-digit',
-    second: '2-digit',
-    hour12: true
-  });
-  const tzPart = new Intl.DateTimeFormat('en-US', {
-    timeZoneName: 'short'
-  })
-    .formatToParts(now)
-    .find(p => p.type === 'timeZoneName').value;
-  return `${datePart} ${timePart} ${tzPart}`;
-};
-
 // --- GAME DETECTION ---
 // Map<lowercase-alias, { canonical, re }> built once at module load so detectGame
 // doesn't allocate a fresh RegExp per game/alias per call.
@@ -233,16 +208,6 @@ function getPriorityEmoji(priority) {
   }
 }
 
-function getPriorityColor(priority) {
-  switch (priority) {
-    case 'high': return 0xFF0000;
-    case 'low': return 0x00FF00;
-    case 'normal':
-    case 'medium':
-    default: return CONFIG.EMBED_COLOR_INFO;
-  }
-}
-
 // --- TEMPLATE VARIABLES ---
 
 function replaceVariables(template, context = {}) {
@@ -292,13 +257,6 @@ function sanitizeEmbedText(str) {
 
 // --- EMBED TRUNCATION ---
 
-/** Truncate a string for use as an embed field value (max 1024). */
-function truncateEmbedField(str, max = 1024) {
-  if (str == null) return '';
-  const s = String(str);
-  return s.length > max ? s.slice(0, max - 3) + '...' : s;
-}
-
 /** Truncate a string for use as an embed description (max 4096). */
 function truncateEmbedDescription(str, max = 4096) {
   if (str == null) return '';
@@ -381,24 +339,17 @@ function enforceEmbedLimit(embeds) {
 
 module.exports = {
   sanitizeEmbedText,
-  truncateEmbedField,
   truncateEmbedDescription,
   enforceEmbedLimit,
-  BLOCK_TAG_REGEX,
-  escapeRegex,
   escapeHtml,
   safeEqual,
   isStaff,
-  decodeHtmlEntities,
   htmlToTextWithBlocks,
-  decodeGmailData,
   getCleanBody,
   stripEmailQuotes,
   stripMobileFooter,
   extractRawEmail,
-  getFormattedDate,
   detectGame,
   getPriorityEmoji,
-  getPriorityColor,
   replaceVariables
 };