[BUG] chats.update / initial history sync discard the archived flag before it reaches webhooks or the database #2743

📋 Bug Description

When a chat is archived/unarchived on the phone (or any linked device), Baileys emits the change via chats.update with an archived: true/false field. Evolution's chats.update handler in whatsapp.baileys.service.ts (WHATSAPP-BAILEYS integration) discards every field except remoteJid before forwarding to the webhook or writing to the DB:

"chats.update": async (e) => {
  const chatsRaw = e.map(chat => ({ remoteJid: chat.id, instanceId: this.instanceId }));
  this.sendDataWebhook('chats.update', chatsRaw);
  for (const chat of e)
    await this.prismaRepository.chat.updateMany({
      where: { instanceId: this.instanceId, remoteJid: chat.id, name: chat.name },
      data: { remoteJid: chat.id },
    });
}

(from compiled dist/api/integrations/channel/whatsapp/whatsapp.baileys.service.js, v2.3.7)

The messaging-history.set handler (emits chats.set) does the same trim, and additionally only forwards chats not already in the Chat table — so even a fresh reconnect can't backfill archive state for chats Evolution already knows about.

The Chat Postgres table also has no archived column at all:

Table "public.Chat"
id | remoteJid | labels | createdAt | updatedAt | instanceId | name | unreadMessages

So there is currently no way for an integrator to learn a chat's real archived state via webhook, DB, or GET /chat/findChats/:instance — it's dropped at the earliest point in Evolution's own pipeline.

🔄 Steps to Reproduce

1. Connect an instance (WHATSAPP-BAILEYS) with the chats.update webhook enabled.
2. Archive (or unarchive) any chat directly on the linked phone.
3. Inspect the delivered chats.update webhook payload.
4. Check the Chat row for that remoteJid via GET /chat/findChats/:instance or Postgres directly.

✅ Expected Behavior

chats.update carries the chat's current archived boolean, it's persisted on the Chat row, and findChats returns it — so integrators can mirror the phone's real archived list instead of maintaining a local-only flag.

❌ Actual Behavior

chats.update/chats.set payloads only ever contain {remoteJid, instanceId[, name]}. archived is silently discarded.

🌍 Environment

• OS: Ubuntu (Docker host)
• Evolution API version: 2.3.7
• Integration: WHATSAPP-BAILEYS
• Database: PostgreSQL 13

📝 Additional Context / Proposed Fix

Sketch of a fix, for whoever picks this up:

1. Add archived Boolean @default(false) to the Chat Prisma model (migration).
2. In chats.update, forward archived: chat.archived in the webhook payload and include it in the chat.updateMany write.
3. In messaging-history.set, same field addition; consider also letting already-known chats' archived/pinned/muteEndTime refresh on reconnect, since today only brand-new chats get forwarded at all.
4. Confirm findChats selects/returns the new column once it exists.

Related: #2495 looks like a different symptom in the same area (write-side archiveChat endpoint erroring) — this is the read side: archive state never reaching the integrator in the first place.