Add Nostr relay + seed data to Docker deployment

- Add nostr-rs-relay service to docker-compose for persistent
  comments, reactions, and profiles on the dev server
- Add one-shot seeder container that auto-populates the relay
  with test personas, reactions, and comments on first deploy
- Proxy WebSocket connections through nginx at /relay so the
  frontend connects to the relay on the same host (no CORS)
- Make relay URL dynamic: reads from VITE_NOSTR_RELAYS in dev,
  auto-detects /relay proxy path in production Docker builds
- Make seed scripts configurable via RELAY_URL and ORIGIN env vars
- Add wait-for-relay script for reliable container orchestration
- Add "Resume last played" hero banner on My List tab

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/seed-profiles.ts

@@ -5,7 +5,7 @@ import {
   TASTEMAKER_PERSONAS,
 } from '../src/data/testPersonas.js'
 
-const RELAY_URL = 'ws://localhost:7777'
+const RELAY_URL = process.env.RELAY_URL || 'ws://localhost:7777'
 
 type Persona = { name: string; nsec: string; pubkey: string }