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>

handlers/buttons.js

@@ -16,14 +16,14 @@ const {
 } = require('discord.js');
 const { mongoose } = require('../db-connection');
 const { CONFIG } = require('../config');
-const { makeTicketName, resolveCreatorNickname, getOrCreateTicketCategory, cleanupEmptyOverflowCategory, checkTicketCreationRateLimit, getSenderLocal, toDiscordSafeName } = require('../services/tickets');
+const { makeTicketName, resolveCreatorNickname, getOrCreateTicketCategory, cleanupEmptyOverflowCategory, checkTicketCreationRateLimit, toDiscordSafeName } = require('../services/tickets');
 const { sendTicketClosedEmail } = require('../services/gmail');
 const { getTicketActionRow } = require('../utils/ticketComponents');
-const { sanitizeEmbedText, truncateEmbedDescription, truncateEmbedField, enforceEmbedLimit } = require('../utils');
+const { sanitizeEmbedText, truncateEmbedDescription, enforceEmbedLimit } = require('../utils');
 const { enqueueRename, enqueueSend } = require('../services/channelQueue');
 const { runEscalation, runDeescalation } = require('./commands');
 const { pendingCloses } = require('./pendingCloses');
-const { logError, logSystem } = require('../services/debugLog');
+const { logError } = require('../services/debugLog');
 
 const Ticket = mongoose.model('Ticket');
 const Transcript = mongoose.model('Transcript');
@@ -328,8 +328,6 @@ async function handleClaim(interaction, ticket) {
   }
 
   if (isClaimed && !isClaimedByMe && !CONFIG.ALLOW_CLAIM_OVERWRITE) {
-    const { logSecurity } = require('../services/debugLog');
-    logSecurity('Unauthorized button attempt', interaction.user, interaction.customId).catch(() => {});
     return interaction.reply({
       content: `This ticket is already claimed by **${freshTicket.claimedBy}**.`,
       ephemeral: true
@@ -510,13 +508,8 @@ async function handleConfirmClose(interaction, ticket, sendEmail = true) {
           files: [dmFile]
         });
       } catch (dmErr) {
-        // 50007 = "Cannot send messages to this user" — user has DMs off. Expected class; debug-level only.
-        if (dmErr?.code === 50007) {
-          logSystem('Transcript DM skipped (recipient has DMs disabled)', [
-            { name: 'User', value: creatorId },
-            { name: 'Channel', value: channelName }
-          ]).catch(() => {});
-        } else {
+        // 50007 = "Cannot send messages to this user" — user has DMs off. Expected; ignore.
+        if (dmErr?.code !== 50007) {
           logError('transcript-dm', dmErr).catch(() => {});
         }
       }
@@ -662,8 +655,6 @@ async function handleTicketModal(interaction) {
       parentCategoryId: parentCategoryIdForTicket
     });
 
-    const displayName = interaction.member?.displayName || interaction.user.username;
-
     const descTrimmed = description.length > 500 ? description.slice(0, 497) + '…' : description;
 
     const welcomeEmbed = new EmbedBuilder()