fix(webhook): process every message in a batched payload

[samuelelijah585]

Overview

This PR fixes the WhatsApp webhook handler so that every text message in a batched payload is processed, instead of only the first one. It also applies the same extraction to the rate-limit path and deduplicates messages by id so redeliveries cannot process a message twice.

Related Issue

Changes

📥 Batched Message Extraction

• [MODIFY] src/controllers/bot.controller.ts

  • extractTextMessage now walks every entry and every changes element and collects all value.messages entries instead of reading [0] at each level.
  • Each extracted message is enqueued individually, keyed by its message id.
  • The handler reports success only when every message in the batch was handled.

• [MODIFY] src/middleware/command-rate-limit.middleware.ts

  • extractMessageDetails applies the same full-payload extraction so the rate limiter and abuse history see the same set of messages as the classifier.

• [MODIFY] src/queue/message.queue.ts

  • Enqueue path accepts a message id key so a redelivered payload does not process a message that was already handled.

• [MODIFY] src/__tests__/bot.controller.test.ts

  • Adds a test covering a two-message payload, asserting both messages are enqueued.

Verification Results

npm test
✅ passes locally

Acceptance Criteria	Status
A payload with several messages has all of them enqueued	✅ All entry/changes/messages entries are extracted and enqueued
The response reports success only when every message in the batch was handled	✅ Handler responds success only after the full batch is handled
A redelivered payload does not process a message that was already handled	✅ Messages are keyed by message id on enqueue
A test covers a two-message payload	✅ Added in src/__tests__/bot.controller.test.ts
npm test passes locally	✅ Passes

Closes #255

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