deploy: stabilization and final typings for WhatsApp worker bridge

apps/whatsapp-worker/src/index.ts

@@ -2,7 +2,7 @@ import { logger } from './logger';
 import dns from 'node:dns';
 dns.setDefaultResultOrder('ipv4first');
 
-import fastify from 'fastify';
+import fastify, { FastifyRequest, FastifyReply } from 'fastify';
 import { Queue, Worker, Job } from 'bullmq';
 import dotenv from 'dotenv';
 import Redis from 'ioredis';
@@ -56,7 +56,8 @@ const handlers: Record<string, JobHandler> = {
 };
 
 // ─── HTTP SERVER (Inbound Bridge) ─────────────────────────────────────────────
-// This server receives forwarded webhooks from the Hugging Face Gateway
+// This server receives forwarded webhooks from the Hugging Face Gateway.
+// It acts as a bridge between the public API and the private BullMQ worker.
 const server = fastify({ logger: false });
 
 server.post('/v1/internal/whatsapp/inbound', async (req: FastifyRequest, reply: FastifyReply) => {