strip: remove pattern/surge/chat alert monitoring + unused commands

- delete services/{patternChecker,patternStore,surgeChecker,chatAlertChecker,staffNotifications,staffChannel,notificationRegistry,notificationEnabled,staffPresence}.js
- remove /notification, /staffnotification, /tag, /priority
- /escalate: drop action param, always unclaim
- purge PATTERN_*, SURGE_*, CHAT_ALERT_*, STAFF_* env vars from config + .env.example
- drop StaffNotification model
- ~2500 LOC removed
- settings-site /internal/notifications/* endpoints gone (UI will 404 until trimmed)

.env.example

@@ -112,16 +112,10 @@ PRIORITY_MEDIUM_EMOJI=🟡
 PRIORITY_LOW_EMOJI=🟢
 
 # --- Claiming ---
-CLAIM_TIMEOUT_ENABLED=false
-CLAIM_TIMEOUT_HOURS=48
 AUTO_UNCLAIM_ENABLED=false
 AUTO_UNCLAIM_AFTER_HOURS=24
 ALLOW_CLAIM_OVERWRITE=false
-STAFF_EMOJIS=224692549225283584:🍅        # userId:emoji pairs, comma-separated
-CLAIMER_EMOJI_FALLBACK=🎫                 # fallback if claimer has no entry in STAFF_EMOJIS
-ADMIN_ID=                                 # Discord user ID of the bot admin (for /staffnotification)
-STAFF_NOTIFICATION_CATEGORY_ID=           # Category for staff notification channels (created by /notification add)
-UNCLAIMED_REMINDER_THRESHOLDS=1,2,4       # Comma-separated hour thresholds for unclaimed ticket alerts
+ADMIN_ID=                                 # Discord user ID of the bot admin (for Gmail OAuth failure DMs)
 FORCE_CLOSE_TIMER_SECONDS=60              # Seconds to wait before force-closing a ticket (default 60)
 GMAIL_POLL_INTERVAL_SECONDS=30            # Gmail poll interval in seconds (default 30)
 GMAIL_LOG_CHANNEL_ID=                     # Channel for Gmail poll activity logs
@@ -130,46 +124,6 @@ RENAME_LOG_CHANNEL_ID=                    # Channel for channel rename queue log
 SECURITY_LOG_CHANNEL_ID=                  # Channel for security/audit logs
 SYSTEM_LOG_CHANNEL_ID=                    # Channel for bot lifecycle logs (startup, shutdown, DB events)
 
-# --- Pattern detection ---
-USER_PATTERNS_CHANNEL_ID=                 # Channel for repeat-user pattern alerts
-GAME_PATTERNS_CHANNEL_ID=                 # Channel for game-specific pattern alerts
-TAG_PATTERNS_CHANNEL_ID=                  # Channel for ticket tag pattern alerts
-ESCALATION_PATTERNS_CHANNEL_ID=           # Channel for escalation pattern alerts
-STAFF_PATTERNS_CHANNEL_ID=                # Channel for staff workload pattern alerts
-COMBINED_PATTERNS_CHANNEL_ID=             # Channel for combined/cross-cutting pattern alerts
-PATTERN_USER_TICKET_THRESHOLD=3           # Tickets per user before alerting
-PATTERN_GAME_TICKET_THRESHOLD=10          # Tickets per game before alerting
-PATTERN_STAFF_STALE_PING_THRESHOLD=5      # Stale pings before alerting
-PATTERN_ESCALATION_THRESHOLD=3            # Escalations before alerting
-PATTERN_RAPID_CLOSE_SECONDS=120           # Seconds; closes faster than this are flagged
-PATTERN_UNCLAIMED_HOURS=4                 # Hours unclaimed before flagging
-PATTERN_CHECK_INTERVAL_MINUTES=30         # Minutes between pattern check runs
-
-# --- Surge & chat alerts ---
-ALL_STAFF_CHANNEL_ID=                     # Channel for staff surge alerts
-ALL_STAFF_CHAT_ALERT_CHANNEL_ID=          # Channel for chat monitoring alerts
-SURGE_ROLE_ID=                            # Role to ping on surge alerts
-SURGE_TICKET_COUNT=10                     # Ticket count to trigger surge
-SURGE_TICKET_WINDOW_MINUTES=30            # Window for ticket surge
-SURGE_GAME_TICKET_COUNT=5                 # Per-game ticket count for surge
-SURGE_GAME_TICKET_WINDOW_MINUTES=30       # Window for game surge
-SURGE_STALE_COUNT=8                       # Stale tickets to trigger alert
-SURGE_STALE_HOURS=2                       # Hours before ticket is stale
-SURGE_NEEDS_RESPONSE_COUNT=5              # Tickets awaiting response to trigger alert
-SURGE_NEEDS_RESPONSE_HOURS=1              # Hours awaiting response
-SURGE_UNCLAIMED_COUNT=5                   # Unclaimed tickets for surge alert
-SURGE_UNCLAIMED_MINUTES=30                # Minutes unclaimed before counting
-SURGE_TIER3_UNCLAIMED_MINUTES=15          # Minutes before tier 3 unclaimed alert
-SURGE_COOLDOWN_MINUTES=60                 # Cooldown between surge alerts
-CHAT_ALERT_CHANNEL_IDS=                   # Comma-separated channel IDs to monitor
-CHAT_ALERT_MESSAGE_COUNT=5                # Unresponded messages to trigger alert
-CHAT_ALERT_HOURS_WITHOUT_RESPONSE=2       # Hours without staff response to alert
-CHAT_ALERT_COOLDOWN_MINUTES=60            # Cooldown between chat alerts
-STAFF_IDS=                                # Comma-separated Discord user IDs of all staff members
-SURGE_NO_STAFF_COOLDOWN_MINUTES=30        # Cooldown between zero-staff alerts
-SURGE_NO_STAFF_OPEN_TICKET_THRESHOLD=3    # Min open tickets before alerting
-STAFF_DND_COUNTS_AS_AVAILABLE=false       # Whether DND status counts as available
-
 # --- Staff threads ---
 STAFF_THREAD_ENABLED=false                # Create a private staff thread on each ticket channel
 STAFF_THREAD_NAME=Staff Discussion        # Name of the private thread