Slack slash command

Handles Slack slash commands (/atlas). Acks within 3 seconds and processes the query asynchronously. Requires SLACK_SIGNING_SECRET. Request signature is verified via x-slack-signature header.

curl -X POST "http://localhost:3001/api/v1/slack/commands"

{
  "response_type": "string",
  "text": "string"
}

{
  "error": "string",
  "message": "string",
  "requestId": "string"
}