refactor: optimize rate limiting, harden WebSocket parsing, update webhook payload formatting, and cleanup Docker assets

feat: add optional WhatsApp integration with toggle and status monitoring

feat: implement graceful shutdown after successful configuration application

feat: add cooldown period to WhatsApp status checks to prevent redundant pairing requests

fix: patch OpenClaw scope-clearing bug and refactor WhatsApp session logout logic to error handler

refactor: update gateway connection handshake parameters and scope permissions for health-server and wa-guardian

refactor: simplify gateway connection logic and update client handshake parameters

feat: update gateway connection to use token authentication, origin headers, and web client identification

feat: update connection handshake parameters with protocol versioning and client metadata

feat: implement persistent WhatsApp session backup and restore via workspace sync and add automatic session invalidation on auth errors

feat: implement auth failure cooldowns, add loopback trusted proxies, and enhance health server status reporting

feat: implement wa-guardian for automated WhatsApp pairing and add Control UI shortcut to dashboard