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>

routes/internalApi.js

@@ -4,7 +4,6 @@ const { ChannelType } = require('discord.js');
 const { CONFIG } = require('../config');
 const { safeEqual } = require('../utils');
 const { applyConfigUpdates, readAllConfig } = require('../services/configPersistence');
-const { logSystem } = require('../services/debugLog');
 const { ALLOWED_CONFIG_KEYS } = require('../services/configSchema');
 
 const router = express.Router();
@@ -54,11 +53,6 @@ router.post('/config', express.json(), async (req, res) => {
     return res.status(400).json({ error: `Disallowed config keys: ${rejected.join(', ')}` });
   }
   const result = applyConfigUpdates(updates);
-  const errorSummary = result.errors.map(e => `${e.key}: ${e.error}`).join(', ');
-  await logSystem('Config updated via settings UI', [
-    { name: 'Keys updated', value: result.applied.join(', ') || 'none', inline: false },
-    { name: 'Errors', value: errorSummary || 'none', inline: false }
-  ]).catch(() => {});
   // Partial success stays 200 so the client can still apply the successful keys.
   // Only 400 when every submitted key failed validation (i.e. the save did nothing).
   const totalSubmitted = Object.keys(updates).length;
@@ -69,7 +63,7 @@ router.post('/config', express.json(), async (req, res) => {
 // GET /discord/guild — return guild info for smart dropdowns
 router.get('/discord/guild', async (req, res) => {
   try {
-    const client = require('../api/botClient').getBot();
+    const client = require('../broccolini-discord').client;
     if (!client) return res.status(503).json({ error: 'Bot not ready' });
 
     const guild = client.guilds.cache.get(CONFIG.DISCORD_GUILD_ID);
@@ -178,9 +172,6 @@ router.post('/gmail/reload', express.json(), async (req, res) => {
     if (parent.setGmailPollInterval) {
       parent.setGmailPollInterval(CONFIG.GMAIL_POLL_INTERVAL_MS);
     }
-    await logSystem('Gmail OAuth reloaded', [
-      { name: 'Account', value: emailAddress, inline: false }
-    ]).catch(() => {});
     res.json({ ok: true, email: emailAddress });
   } catch (err) {
     const oauthError = err && err.response && err.response.data && err.response.data.error;