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>

services/configSchema.js

@@ -19,8 +19,7 @@
 
 const ALLOWED_CONFIG_KEYS = new Set([
   // Ticket settings
-  'TICKET_CATEGORY_ID', 'TICKET_CATEGORY_NAME', 'TICKET_T2_CATEGORY_NAME', 'TICKET_T3_CATEGORY_NAME',
-  'EMAIL_TICKET_OVERFLOW_CATEGORY_IDS', 'DISCORD_TICKET_CATEGORY_ID', 'DISCORD_TICKET_OVERFLOW_CATEGORY_IDS',
+  'TICKET_CATEGORY_ID', 'TICKET_CATEGORY_NAME', 'DISCORD_TICKET_CATEGORY_ID',
   // Escalation categories
   'EMAIL_ESCALATED2_CHANNEL_ID', 'DISCORD_ESCALATED2_CHANNEL_ID',
   'EMAIL_ESCALATED3_CHANNEL_ID', 'DISCORD_ESCALATED3_CHANNEL_ID',
@@ -29,12 +28,11 @@ const ALLOWED_CONFIG_KEYS = new Set([
   'ADMIN_ID',
   // Channel IDs
   'TRANSCRIPT_CHANNEL_ID', 'LOGGING_CHANNEL_ID', 'DEBUGGING_CHANNEL_ID',
-  'DISCORD_CHANNEL_ID',
   'RENAME_LOG_CHANNEL_ID',
   // Messages and labels
   'ESCALATION_MESSAGE', 'TICKET_CLOSE_SUBJECT_PREFIX', 'TICKET_CLOSE_MESSAGE', 'TICKET_CLOSE_SIGNATURE',
   'DISCORD_CLOSE_MESSAGE', 'DISCORD_TRANSCRIPT_MESSAGE', 'DISCORD_AUTO_CLOSE_MESSAGE',
-  'AUTO_CLOSE_MESSAGE', 'TICKET_WELCOME_MESSAGE', 'TICKET_CLAIMED_MESSAGE', 'TICKET_UNCLAIMED_MESSAGE',
+  'TICKET_WELCOME_MESSAGE', 'TICKET_CLAIMED_MESSAGE', 'TICKET_UNCLAIMED_MESSAGE',
   'REMINDER_MESSAGE', 'BUTTON_LABEL_CLOSE', 'BUTTON_LABEL_CLAIM', 'BUTTON_LABEL_UNCLAIM',
   'BUTTON_EMOJI_CLOSE', 'BUTTON_EMOJI_CLAIM', 'BUTTON_EMOJI_UNCLAIM',
   // Branding
@@ -46,11 +44,11 @@ const ALLOWED_CONFIG_KEYS = new Set([
   'STAFF_THREAD_ENABLED', 'STAFF_THREAD_NAME', 'STAFF_THREAD_AUTO_ADD_ROLE', 'STAFF_THREAD_ROLE_ID',
   'PIN_INITIAL_MESSAGE_ENABLED', 'PIN_ESCALATION_MESSAGE_ENABLED', 'PIN_SUPPRESS_SYSTEM_MESSAGE',
   // Limits and thresholds
-  'GLOBAL_TICKET_LIMIT', 'TICKET_LIMIT_PER_CATEGORY',
+  'GLOBAL_TICKET_LIMIT',
   'RATE_LIMIT_TICKETS_PER_USER', 'RATE_LIMIT_WINDOW_MINUTES',
   'FORCE_CLOSE_TIMER_SECONDS', 'GMAIL_POLL_INTERVAL_SECONDS',
   // Embed colors
-  'EMBED_COLOR_OPEN', 'EMBED_COLOR_CLOSED', 'EMBED_COLOR_CLAIMED', 'EMBED_COLOR_ESCALATED', 'EMBED_COLOR_INFO',
+  'EMBED_COLOR_OPEN', 'EMBED_COLOR_CLAIMED', 'EMBED_COLOR_ESCALATED', 'EMBED_COLOR_INFO',
   'PRIORITY_HIGH_EMOJI', 'PRIORITY_MEDIUM_EMOJI', 'PRIORITY_LOW_EMOJI'
 ]);
 
@@ -201,32 +199,7 @@ function getValidator(key) {
   return VALIDATORS[inferType(key)];
 }
 
-// Pre-build per-key validator map for callers that want O(1) lookup
-// (and for the smoke test / boot log).
-const ALL_VALIDATORS = {};
-for (const key of ALLOWED_CONFIG_KEYS) {
-  ALL_VALIDATORS[key] = getValidator(key);
-}
-
-// ---------- Startup log (no-op if console.log is suppressed) ----------
-
-(function logDistribution() {
-  const dist = {};
-  const fallback = [];
-  for (const [key, v] of Object.entries(ALL_VALIDATORS)) {
-    dist[v.type] = (dist[v.type] || 0) + 1;
-    if (v.type === 'string') fallback.push(key);
-  }
-  console.log('[configSchema] type distribution:', JSON.stringify(dist));
-  if (fallback.length) {
-    console.log(`[configSchema] ${fallback.length} keys use fallback 'string' validator:`, fallback.join(', '));
-  }
-})();
-
 module.exports = {
   ALLOWED_CONFIG_KEYS,
-  VALIDATORS,
-  ALL_VALIDATORS,
-  getValidator,
-  inferType
+  getValidator
 };