Remove dead/stale code, dedup close+escalation paths

Dead/stale removals (grep-confirmed no consumers):
- config: drop 9 unread CONFIG keys (ROLE_TO_PING_ID, SIGNATURE,
  REMINDER_*, RENAME_LOG_CHANNEL_ID, SETTINGS_*); remove their
  ALLOWED_CONFIG_KEYS entries and the orphaned settings-site UI fields
- configSchema: delete unreachable json/string_or_json validators
- models: drop unused ticketTag field
- gmail-poll: remove unused isPollSuspended export
- utils: remove dead htmlToTextWithBlocks/decodeHtmlEntities/BLOCK_TAG_REGEX
- internalApi: remove router._allowedKeys (test it served is gone)
- discord client: drop unused GuildPresences privileged intent
- broccolini-discord: remove dormant /api 503 gate (no /api routes)

Fixes:
- context-menu ticket create now uses makeTicketName('unclaimed', ...)
  instead of the contract-violating ticket-<n> name
- drop write-only pending.userId from both close paths

Dedup / simplify:
- new services/transcript.js shares the transcript text/date/header
  builders between the button and force-close paths (had drifted)
- resolveEscalationCategoryId() replaces 3 copies of the category logic
- ticketChannelOverwrites() shares the create-permission array between
  the two interactive ticket-create paths
- finalizeBody() shares the email-cleanup tail in parseGmailMessage
- getTicketActionRow drops its never-passed options arg;
  sendTicketNotificationEmail drops its always-null subjectLine arg
- hoist invariant guild lookup out of the auto-close/unclaim loops
- drop redundant lastActivity write (and now-dead updateTicketActivity)
- /help lists all current commands and the right-click apps

config.js

@@ -17,7 +17,6 @@ const CONFIG = {
   TICKET_CATEGORY_NAME: process.env.TICKET_CATEGORY_NAME || 'Open Tickets',
   DISCORD_TICKET_CATEGORY_ID: process.env.DISCORD_TICKET_CATEGORY_ID || process.env.TICKET_CATEGORY_ID,
   ROLE_ID_TO_PING: process.env.ROLE_ID_TO_PING,
-  ROLE_TO_PING_ID: process.env.ROLE_ID_TO_PING || process.env.ROLE_TO_PING_ID,
   TRANSCRIPT_CHANNEL_ID: process.env.TRANSCRIPT_CHANNEL_ID,
   LOGGING_CHANNEL_ID: process.env.LOGGING_CHANNEL_ID,
   DEBUGGING_CHANNEL_ID: process.env.DEBUGGING_CHANNEL_ID || null,
@@ -30,7 +29,6 @@ const CONFIG = {
   CLAIMER_EMOJI_FALLBACK: process.env.CLAIMER_EMOJI_FALLBACK || '🎫',
   PORT: toInt(process.env.DISCORD_ONLY_PORT, 5000),
   HEALTHCHECK_HOST: process.env.HEALTHCHECK_HOST || null, // null = listen on all interfaces; set to 127.0.0.1 for local-only
-  SIGNATURE: (process.env.EMAIL_SIGNATURE || '').trim().replace(/\\n/g, '\n'),
   GAME_LIST: process.env.GAME_LIST || '',
   // Tier 2/3 escalation: category IDs where ticket channels are placed (env uses *_CHANNEL_* for legacy naming).
   EMAIL_ESCALATED2_CHANNEL_ID: process.env.EMAIL_ESCALATED2_CHANNEL_ID || null,
@@ -56,9 +54,6 @@ const CONFIG = {
   TICKET_WELCOME_MESSAGE: process.env.TICKET_WELCOME_MESSAGE || "We got your ticket. We'll be with you as soon as possible. Feel free to add any additional information to your ticket.",
   TICKET_CLAIMED_MESSAGE: process.env.TICKET_CLAIMED_MESSAGE || 'Ticket claimed by {staff_mention} 🚀',
   TICKET_UNCLAIMED_MESSAGE: process.env.TICKET_UNCLAIMED_MESSAGE || 'Ticket unclaimed by {staff_mention} ☀️',
-  REMINDER_ENABLED: process.env.REMINDER_ENABLED === 'true',
-  REMINDER_AFTER_HOURS: toInt(process.env.REMINDER_AFTER_HOURS, 24),
-  REMINDER_MESSAGE: process.env.REMINDER_MESSAGE || 'Hey {ping}! This ticket has been inactive for {hours} hours. Please provide an update or close the ticket.',
   PRIORITY_ENABLED: process.env.PRIORITY_ENABLED === 'true',
   DEFAULT_PRIORITY: process.env.DEFAULT_PRIORITY || 'normal',
   PRIORITY_HIGH_EMOJI: process.env.PRIORITY_HIGH_EMOJI || '🔴',
@@ -80,7 +75,6 @@ const CONFIG = {
   ADMIN_ID: process.env.ADMIN_ID || null,
   FORCE_CLOSE_TIMER: toInt(process.env.FORCE_CLOSE_TIMER_SECONDS, 60),
   GMAIL_POLL_INTERVAL_MS: toInt(process.env.GMAIL_POLL_INTERVAL_SECONDS, 30) * 1000,
-  RENAME_LOG_CHANNEL_ID: process.env.RENAME_LOG_CHANNEL_ID || null,
   STAFF_THREAD_ENABLED: process.env.STAFF_THREAD_ENABLED === 'true',
   STAFF_THREAD_NAME: process.env.STAFF_THREAD_NAME || 'Staff Discussion',
   STAFF_THREAD_AUTO_ADD_ROLE: process.env.STAFF_THREAD_AUTO_ADD_ROLE === 'true',
@@ -89,9 +83,6 @@ const CONFIG = {
   PIN_ESCALATION_MESSAGE_ENABLED: process.env.PIN_ESCALATION_MESSAGE_ENABLED === 'true',
   TRANSCRIPT_DM_TO_CREATOR: process.env.TRANSCRIPT_DM_TO_CREATOR === 'true',
   PIN_SUPPRESS_SYSTEM_MESSAGE: process.env.PIN_SUPPRESS_SYSTEM_MESSAGE === 'true',
-  SETTINGS_PORT: toInt(process.env.SETTINGS_PORT, 12752),
-  SETTINGS_ADMIN_PASSWORD: process.env.SETTINGS_ADMIN_PASSWORD || null,
-  SETTINGS_DOMAIN: process.env.SETTINGS_DOMAIN || 'tickets.indifferentketchup.com',
   INTERNAL_API_PORT: toInt(process.env.INTERNAL_API_PORT, 12753),
   INTERNAL_API_SECRET: process.env.INTERNAL_API_SECRET || null
 };