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>

.env.example

@@ -14,10 +14,8 @@ DISCORD_GUILD_ID=                 # Server (guild) ID where the bot runs
 DISCORD_TICKET_CATEGORY_ID=       # Category for Discord-originated ticket channels
 TICKET_CATEGORY_ID=               # Category for email-originated ticket channels
 
-# Category display names (primary must match the category name in Discord; overflow folders are created as "{name} (Overflow 1)", etc.)
+# Category display name (primary must match the category name in Discord; overflow folders are created as "{name} (Overflow 1)", etc.)
 TICKET_CATEGORY_NAME=Open Tickets
-TICKET_T2_CATEGORY_NAME=Tier 2 Escalated Tickets
-TICKET_T3_CATEGORY_NAME=Tier 3 Escalated Tickets
 
 # Escalation categories (tier 2 and tier 3)
 DISCORD_ESCALATED_CATEGORY_ID=    # Fallback escalation category (Discord)
@@ -32,7 +30,6 @@ ROLE_ID_TO_PING=                  # Role ID to ping on new tickets (config also
 TRANSCRIPT_CHANNEL_ID=            # Channel for ticket transcripts on close
 LOGGING_CHANNEL_ID=               # Channel for lifecycle log messages
 DEBUGGING_CHANNEL_ID=             # Channel for error logs (escalate, poll, etc.); optional
-DISCORD_CHANNEL_ID=               # General Discord channel (if used)
 
 # --- Discord: Ticket copy & buttons ---
 # ESCALATION_MESSAGE: use {support_name} for SUPPORT_NAME
@@ -50,8 +47,7 @@ GOOGLE_CLIENT_SECRET=             # OAuth2 Client Secret
 REFRESH_TOKEN=                    # OAuth2 refresh token for the support inbox
 MY_EMAIL=                         # Support inbox email address
 
-# --- Server & URLs ---
-NGROK_URL=                        # Public URL (optional); run ngrok outside this repo
+# --- Server ---
 DISCORD_ONLY_PORT=5000            # Port for healthcheck / Discord-only server
 # HEALTHCHECK_HOST=               # Optional; bind address for health server (default: all interfaces; use 127.0.0.1 for local-only)
 
@@ -74,7 +70,6 @@ DISCORD_AUTO_CLOSE_MESSAGE=      # Message in ticket when auto-closed (e.g. ...
 
 # --- Ticket limits & permissions ---
 GLOBAL_TICKET_LIMIT=5             # Max concurrent open tickets globally
-TICKET_LIMIT_PER_CATEGORY=3       # Max tickets per category
 RATE_LIMIT_TICKETS_PER_USER=0     # Max tickets per user per window (0 = disabled)
 RATE_LIMIT_WINDOW_MINUTES=60      # Window in minutes for per-user rate limit
 BLACKLISTED_ROLES=                # Comma-separated role IDs that cannot open tickets
@@ -83,7 +78,6 @@ ADDITIONAL_STAFF_ROLES=           # Comma-separated role IDs with staff permissi
 # --- Auto-close ---
 AUTO_CLOSE_ENABLED=false
 AUTO_CLOSE_AFTER_HOURS=72
-AUTO_CLOSE_MESSAGE=               # Message when ticket is auto-closed
 
 # --- Reminders ---
 REMINDER_ENABLED=false
@@ -140,7 +134,6 @@ GAME_LIST=Project Zomboid, Minecraft, ...
 
 # --- Embed colors (hex with 0x prefix) ---
 EMBED_COLOR_OPEN=0x00FF00
-EMBED_COLOR_CLOSED=0xFF0000
 EMBED_COLOR_CLAIMED=0xFFFF00
 EMBED_COLOR_ESCALATED=0xFF6600
 EMBED_COLOR_INFO=0x1e2124