feat: TTLock integration + fix agent offline status

- Add TTLock electronic lock module: settings page, room-lock mapping,
  card issuance via agent command (ttlock:write_card)
- Fix agent offline: EquipmentPage now polls every 30s + reacts to
  workstation:online/offline WebSocket events instantly
- Backend broadcasts workstation online/offline events to hotel clients
  via existing WebSocket (agent-ws.ts)
- New DB migration 048_ttlock.sql: hotel_ttlock_config, room_lock_mappings,
  card_issuances tables
- New backend routes: GET/PATCH ttlock/config, POST ttlock/token,
  GET ttlock/locks, POST/DELETE ttlock/room-locks, POST issue-card
- "Выдать ключ (TTLock)" button in BookingDetailPanel for confirmed/checked_in
- TTLock page added to sidebar under Настройки

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/migrations/048_ttlock.sql

@@ -0,0 +1,52 @@
+-- TTLock integration: credentials, room-to-lock mapping, card issuance log
+
+-- TTLock API credentials per hotel (Open Platform)
+CREATE TABLE IF NOT EXISTS hotel_ttlock_config (
+  id               UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+  hotel_id         UUID        NOT NULL REFERENCES hotels(id) ON DELETE CASCADE,
+  is_enabled       BOOLEAN     NOT NULL DEFAULT false,
+  client_id        TEXT        NOT NULL DEFAULT '',
+  client_secret    TEXT        NOT NULL DEFAULT '',
+  ttlock_username  TEXT        NOT NULL DEFAULT '',
+  ttlock_password  TEXT        NOT NULL DEFAULT '',
+  access_token     TEXT,
+  refresh_token    TEXT,
+  token_expires_at TIMESTAMPTZ,
+  -- Which workstation has the card encoder attached
+  workstation_id   UUID        REFERENCES workstations(id) ON DELETE SET NULL,
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  UNIQUE(hotel_id)
+);
+
+-- Mapping: room → TTLock lock_id
+CREATE TABLE IF NOT EXISTS room_lock_mappings (
+  id         UUID    PRIMARY KEY DEFAULT gen_random_uuid(),
+  hotel_id   UUID    NOT NULL REFERENCES hotels(id) ON DELETE CASCADE,
+  room_id    UUID    NOT NULL REFERENCES rooms(id) ON DELETE CASCADE,
+  lock_id    BIGINT  NOT NULL,
+  lock_name  TEXT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  UNIQUE(hotel_id, room_id)
+);
+
+-- Log of every card issuance
+CREATE TABLE IF NOT EXISTS card_issuances (
+  id             UUID    PRIMARY KEY DEFAULT gen_random_uuid(),
+  hotel_id       UUID    NOT NULL REFERENCES hotels(id) ON DELETE CASCADE,
+  booking_id     UUID    NOT NULL REFERENCES bookings(id) ON DELETE CASCADE,
+  room_id        UUID    NOT NULL REFERENCES rooms(id),
+  lock_id        BIGINT  NOT NULL,
+  ttlock_card_id BIGINT,
+  issued_by      UUID    REFERENCES users(id),
+  issued_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  check_in       TIMESTAMPTZ NOT NULL,
+  check_out      TIMESTAMPTZ NOT NULL,
+  is_revoked     BOOLEAN NOT NULL DEFAULT false,
+  revoked_at     TIMESTAMPTZ,
+  revoked_by     UUID    REFERENCES users(id),
+  notes          TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_card_issuances_booking ON card_issuances(booking_id);
+CREATE INDEX IF NOT EXISTS idx_card_issuances_hotel   ON card_issuances(hotel_id);