Multi-client WhatsApp Business: support + sales + memory + tools + past-history.
Stack: DeepSeek + LightRAG + Postgres + Evolution + SOUL profiles
GET /clients/{instance}/chats — List all chats with message counts
GET /clients/{instance}/messages/{jid} — Get past messages for a contact
POST /clients/{instance}/import — Import past chats into LightRAG
POST /clients/hermes-whatsapp/import
{
"contact_jid": null, // null = all chats
"max_per_chat": 500,
"max_chats": 50
}