feat(backend): implement payload sanitization and strict validation for WebSocket Relay Service - #1595
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…or WebSocket Relay Service - Add websocket-relay-validation: deep payload sanitization (prototype-pollution keys, control/bidi chars, depth/size limits), strict zod schemas for join:merchant / join:checkout / leave:checkout (UUID-only, unknown keys rejected), and a per-socket guard that reports errors via ack or relay:error, logs without raw payloads, and disconnects repeat offenders - Extract relay server setup from app.js into websocket-relay-server; cap maxHttpBufferSize at 16 KiB (configurable via WS_MAX_HTTP_BUFFER_SIZE) - Sanitize outbound checkout:presence and Horizon poller payment events - Deep-sanitize field values in sanitizeRelayMessage - Fix TypeError crash on join:* events sent without a payload - Add unit + real Socket.IO integration tests and docs Closes emdevelopa#1452 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Closes #1452