docs: update CLAUDE.md, README.md, PROMPT.md, setup.sh per post-change checklist

- Prisma 7 notes: adapter-pg, no url in schema
- README: setup.sh commands, first admin auto-assign, pgbouncer in docker
- PROMPT.md: Prisma 7 adapter-pg description
- setup.sh dev: reordered (kill first, containers before prisma, healthchecks)

PROMPT.md

@@ -16,7 +16,7 @@ Key differentiators:
 - **Backend:** Node.js (Next.js Route Handlers). LiveKit Server Node SDK (`livekit-server-sdk`) for token generation and room management.
 - **Authentication:** `better-auth` with Prisma adapter. Email/Password for Hosts and Admins. Guests join without auth (name-only entry), with a `user_id` column reserved for future LMS account linking.
 - **AI Module:** Python — LiveKit Agents framework (`livekit-agents`). Real-time STT via `livekit-plugins-deepgram` (streaming, low latency). Post-lecture summarization via OpenAI GPT API (`livekit-plugins-openai`).
-- **Database:** PostgreSQL with Prisma 7 ORM. Config in `prisma.config.ts` (Prisma 7 pattern — no `url` in schema datasource).
+- **Database:** PostgreSQL with Prisma 7 ORM. Config in `prisma.config.ts` (`migrate.url()` for CLI). Runtime connection via `@prisma/adapter-pg` driver adapter — no `url` in schema datasource (Prisma 7 forbids it).
 - **Storage:** S3-compatible storage (MinIO self-hosted on Proxmox, or AWS S3) for recordings, shared files, and chat attachments.
 - **Reverse Proxy:** Traefik v3 with automatic Let's Encrypt SSL (production). Local dev runs on direct ports without proxy.
 - **PDF Export:** `@react-pdf/renderer` for generating downloadable lecture summaries.