llmsatwork API

This is the backend app. Webhook endpoints land at:

• /api/vapi/webhook — VAPI tool/lifecycle webhooks (LLM-39)
• /api/stripe/webhook — Stripe subscription events (LLM-79)
• /api/inngest — Inngest function registration (LLM-53)
• /api/admin/* — admin APIs consumed by Retool

imports: @llmsatwork/db, @llmsatwork/vapi, @llmsatwork/voice